Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f21ace265c87ce4…

MALICIOUS

PDF

77.7 KB Created: 2021-04-19 20:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a1da403e4e85bae458b2140a3c83d1a5 SHA-1: b1234507426659227fc612d78677bfc9a745eec8 SHA-256: 7f21ace265c87ce4c680689287c2a8588d262e4dbeeac9a2ee60e11abf708fda
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://seumenha.ru/strik?utm_term=i+am+enough+the+way+i+am+tattoo+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488323/normal_60238efd6e22c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5ff9f264257e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416140/normal_601bc23f0e1ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447465/normal_5ff607b028c64.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/london_bus_11_route.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_6057c24bbfbd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_602ef494eae64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_60412ada666b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fcfb2cd28811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_699d21c1e95342b7967330b8ada13f53.pdf?index=trueIn PDF document text
    • http://vakusidoler.epizy.com/business_model_canvas_template_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/91110177692.pdfIn PDF document text
    • http://sulegezusaz.epizy.com/41232783743.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/boards_and_beyond_step_1_checklist.pdfIn PDF document text
    • http://tuxigufujera.rf.gd/business_strategy_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/22938979813.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/blood_relation_with_answers.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_d7509bf8ace543c38ddde407e9e0082c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/el_aleph_borges.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 4924 bytes
SHA-256: 1c2fdf7a37d78b346bd7e252b99fae4401e8c92b4b55698f5653733d13d39764
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10096 bytes
SHA-256: 1e504a646d7fe31f2f9a6902b659f50e3b9cf5df6edb868e9a7d5df6cf464add

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