Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e880a77562bc9f4…

MALICIOUS

PDF

77.2 KB Created: 2021-06-04 09:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e943e9ae6bad629d01dfff6257f81c51 SHA-1: b1891457fb7d4f83669a4e440ca2a0f51f309e32 SHA-256: 0e880a77562bc9f4e7e59c522b42217e5f82d13052cf42980f72e98cf58387f9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://zajinet.ru/123?utm_term=battleship+game+hack+apk PDF link annotation
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/zafon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5ff6913d37d3b.pdfIn PDF document text
    • https://wubepina.weebly.com/uploads/1/3/4/7/134721378/kifaxofiwojev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_604fb49b8045c.pdfIn PDF document text
    • https://jivimukik.weebly.com/uploads/1/3/0/7/130775904/071c52fbe6c16.pdfIn PDF document text
    • https://keminugugenoxag.weebly.com/uploads/1/3/4/3/134321568/zorikipemelopetometo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454286/normal_602ea7465d6a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_6011b2c7d0c4b.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/mozujewigirozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_6020ae131efa1.pdfIn PDF document text
    • https://sodejokare.weebly.com/uploads/1/3/4/3/134349501/af07b061efdb.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/wanatokusazuvoliz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizelabe.pbworks.com/w/file/fetch/144598728/how_can_i_hack_coin_master_spin.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144464490/how_to_cheat_coin_master_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0e972a-2655-457e-9d7a-8649404a2f85/30807199959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f256f56c-2bd3-4742-9e2a-94980f61138f/jofowobukomuvapapanurukip.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/sanolaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/600b3d3e-29bb-404e-a0d7-03423154d170/laruzokodobujaxumexizab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0672946a-cea0-40bf-8605-7ff62a536cde/how_to_get_started_writing_an_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7039f65e-8115-4cd4-b280-041e53b7a089/samadhi_-_guided_meditation_1-_breath_as_the_bridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9453e341-8304-4081-a685-88897babbc0a/lesson_2-3_solving_two-step_and_multi_step_equations_answers.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_off0000ed65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 5364 bytes
SHA-256: 4835ce51e0ec2ed1010fdb4ebdec2549721eafb57f9ea75491c694a1f3c44594
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 11176 bytes
SHA-256: 16dd8a04a09a6ad611d666a5b37a9388e52a838d1c0fbf54eaa171de8784fe24

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