Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e99da96350d2585…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 10:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bb27582a802095b4e66c9209ed2d42d SHA-1: dc78c32aed9e92244af769bad5a5cb4f75f10513 SHA-256: 4e99da96350d25855a23e2f607e2582f36e694ec046cde80e9c985dcc5a3aa9b
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 0.9998

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/aws?utm_term=how+to+remove+a+stuck+vhs+tape PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421959/normal_604473517fd25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6027b49ec3edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_602afbb5bf076.pdfIn PDF document text
    • http://samokex.sportsontheweb.net/surabaya_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcedc611895f.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/14846313545.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408984/normal_5fe5dc5590765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_60318fcf171b2.pdfIn PDF document text
    • http://felagem.getenjoyment.net/pejopumona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_5feef5a5f0037.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/ziser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_d0cbe4759c05488fa7a5de819a13a9b5.pdf?index=trueIn PDF document text
    • http://dapekafuxururo.myartsonline.com/union_budget_2020_18_highlights.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_1f0ccefdf55c447dba6d703957404311.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_45b093db073143c39083f9f68b587c0c.pdf?index=trueIn PDF document text
    • http://wudemexa.myartsonline.com/the_crown_cast_season_4.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_dd39402c461341888f0685fa58e7e315.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5320 bytes
SHA-256: 5389c0317d8075c4c5aa15ea9f4ca1c8e364d98b1ef1cde0a405587687a8cffd
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10804 bytes
SHA-256: 2032a0f0fb21452a9e0365015f04ceb1ed82c1031ce3782718c6d44e554c1d6f

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