Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b406b8aa6d204…

MALICIOUS

PDF

82.0 KB Created: 2021-06-02 05:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2d585e5db45455fef5876ec81fc5a16b SHA-1: 5e2ee9de2b7513250f3093905adaac432e9f7922 SHA-256: a42b406b8aa6d2047aece6ad51f77f15091dc1469f4d0d2bc448be92c2224202
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'SE_INVOICE_LURE' indicates the document may be disguised as an invoice or payment request. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/pbw?utm_term=ionic+bonding+practice+problems+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374181/normal_603572b068ca8.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/72fadbeb16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_6064f47a941b4.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/3393429.pdfIn PDF document text
    • https://pikimekexer.weebly.com/uploads/1/3/4/5/134587048/bulosirarorero.pdfIn PDF document text
    • https://mevesazikixewo.weebly.com/uploads/1/3/4/3/134366921/nofatez.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/buvul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_6022935b371aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_60296ed7eae7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_6022be5e6097f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_6041381e74889.pdfIn PDF document text
    • https://wotuvakarebor.weebly.com/uploads/1/3/4/6/134665633/jofonesumuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_601f8cdce77c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mukonisu.pbworks.com/f/slope_from_a_table_worksheet_kuta.pdfIn PDF document text
    • http://siseraxoru.pbworks.com/w/file/fetch/144483921/9385326459.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/ca_cold_storage_project_report.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144424563/48503755136.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144424068/super_brawl_universe_apk_obb.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144463980/loxiwunupaka.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 5656 bytes
SHA-256: 33f7e666acb2ab5d8a9fbcf3f0897b3f77ef18942cacf9bc126c3dc7ca761856
font_01_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 11796 bytes
SHA-256: ec58c4f1042c50e8c69204e1bb627a51d34a366ce28a3ca935bca764f9739406

Open this report in the interactive analyzer, or submit your own file for analysis.