Malicious PDF — malware analysis report

Static analysis result for SHA-256 233e508104140c1d…

MALICIOUS

PDF

99.1 KB Created: 2021-03-28 07:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 63ce9db79a36f7c3b8cb98a69ca3b609 SHA-1: 66e15ffb23ea335d65facaaddcad039717291b0a SHA-256: 233e508104140c1de1225cf1c7030fb1a864b9f7c01022f9d539204871ca2234
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure for payment requests and includes a link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to exploit vulnerabilities or trick users into navigating to malicious sites, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=payment+request+letter+sample+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5fd80ecccbb79.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/fhavghd/87457809686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fc6d87e31338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_601d4d8d270e0.pdfIn PDF document text
    • https://cdn.sqhk.co/pusuvizodez/JgeihfV/sawumejaxipovadaxakag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fcd64251fbf9.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/fgg1ijc/46579819647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_605063be0d90f.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/ielts_writing_task_2_sample_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fitewamulifat.epizy.com/68586136401.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_c24a69fa569947a69c6568b2cdfbec54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ab10112-3cd7-4f69-bdcf-e4420ce9d061/28749912347.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_4d52e72986024f9b96b0e6a2a92b895e.pdf?index=trueIn PDF document text
    • http://nasakitubaribud.rf.gd/9517180702.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_536c3599469247f0b49ec983bb832a30.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_24fea751023349fcbafdaca777882e02.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_a24e37fa97e64b078459b2b0047de035.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2385a233-4e43-4732-8947-2264155cc76f/10339897019.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_e4a5c356f24c4002b1277914877272c4.pdf?index=trueIn PDF document text
    • http://vibiwesipo.rf.gd/37797722614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88e234bb-8430-44bd-98fb-10bc8b2fd68f/kubekesogapomawijonisetek.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_d8b898c8f7fe40de90ce6d9de267fd55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d29883-6003-44a1-8744-b3f531c9f9a7/trimble_tsc2_battery_recell.pdfIn PDF document text
    • http://zepedijuva.epizy.com/bacula_configuration_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 5140 bytes
SHA-256: 722661676b0d600fa50d2dafb89a1e49acdf00b3dab6dfd1742a742bc597d75f
font_01_sfnt_off00011f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F89 2492 bytes
SHA-256: 4fd0459769293c7afe6ace699cb0072958d96bf690e82adaba7a2dcc2eacd273
font_02_sfnt_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 11460 bytes
SHA-256: 56704beaba31a9fa29217fc0ae05809bbcddba54fdd6155f40b5737c05752393
font_03_sfnt_off00015239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15239 16216 bytes
SHA-256: b2891d42ba11b9d19425b7bd90cf07d1dee45db0339ff0f2439651c3ef19c803
font_04_sfnt_off00016789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16789 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
font_05_sfnt_off0001753c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1753C 1736 bytes
SHA-256: f27f1dab863be407bc80ce69f069aaa000ada345c50a5fba1d6b915b5f603bb6

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