Malicious PDF — malware analysis report

Static analysis result for SHA-256 358c1c6d9da359a6…

MALICIOUS

PDF

73.1 KB Created: 2021-03-23 12:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 670c25a0998a52b957c077f69e9f9182 SHA-1: a4a2d6005f3e37a82292e660e197f4e8f6421e45 SHA-256: 358c1c6d9da359a6d3f0b36e6889a9c4a76a5d1c25280dce1fa0a0efe94a645c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. Heuristics indicate the PDF is part of a link farm on disposable hosting, aiming to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/wix?keyword=pista+hot+wheels+wall+tracks+starter+set In PDF document text
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/7782898.pdfIn PDF document text
    • http://damvglaz1.xyz/easy_way_to_draw_cartoon_faces11w0t.pdfIn PDF document text
    • http://qunit.space/sowujimajimosaloguxetintcjiq.pdfIn PDF document text
    • http://apkweb.net/which_of_the_following_is_not_a_suitable_assignment_statementoum9a.pdfIn PDF document text
    • http://tonagruz.ru/dua_khatam_al_quran_arabic_textiwuvn.pdfIn PDF document text
    • http://itverys.space/757933255639asvb.pdfIn PDF document text
    • http://winnerslm.space/sonazukobudagubatafbwdm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_604aa57726470.pdfIn PDF document text
    • http://callipakk2.site/ickle_bubba_galaxy_car_seat_manual52ow0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fc8d964c15d5.pdfIn PDF document text
    • http://palitra-cveta.ru/wexarorowojasofibedawomijkhlm.pdfIn PDF document text
    • http://frukt.space/syringomyelia_chiari_malformation_dogslxn0i.pdfIn PDF document text
    • http://reabook.online/basic_immunology_questions_and_answerselttz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_603e41dfa1a02.pdfIn PDF document text
    • http://good-production9.site/18654649465pebdk.pdfIn PDF document text
    • http://biomaniix.website/80939886858vhy83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377407/normal_6015bbc8f291c.pdfIn PDF document text
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/rugufinufifokixeza.pdfIn PDF document text
    • http://limecash.xyz/tepixilibadwhf7k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444378/normal_6040bdeed91cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_4df8586688954de4b2ca9adadd463565.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_84a7424f73da46189c967cd623dac773.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_f470216ed0b846b28a80faaddf3fdb44.pdf?index=trueIn 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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 5044 bytes
SHA-256: 67cf527cf22cd74a677487a18dd3f5b47503ba84bde9dbcb7948cbf9dbc5ba8d
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 12000 bytes
SHA-256: 6389d74c79c7c9d0409624a45c6bfbf24ef87fa10aaff9246ec5be36bece3e9a

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