Malicious PDF — malware analysis report

Static analysis result for SHA-256 6691f254405d5ee2…

MALICIOUS

PDF

77.8 KB Created: 2021-04-24 19:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 43293c4073e9643d2228ca94b83cbed3 SHA-1: 8e78265bf96829a89e53f7d60ccf384ba14c5026 SHA-256: 6691f254405d5ee2f1148d77d78ddae851d63d80e470ddf8f24591d4fc8cc603
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=marshall+amp+mg30dfx+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446647/normal_5fcf7061e7837.pdfIn PDF document text
    • https://gigojajalul.weebly.com/uploads/1/3/4/3/134320096/8136577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_606df2272111d.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/kirawavixoxan-kizaro.pdfIn PDF document text
    • http://dukipor.iblogger.org/venefetutinivotojikapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_60612dc7cda1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381529/normal_5fe0557724e91.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/lomeje.pdfIn PDF document text
    • http://kigaruzolalo.mypressonline.com/the_joy_of_fearing_god.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_6057a9cecffcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_601f1f63bfe2e.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/watermark_document_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_6036148c8fe1a.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/maharashtra_budget_2020_in_marathi.pdfIn PDF document text
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/986bf85ae146d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_da9e05ac81e3474c8d51107cf5363b9c.pdf?index=trueIn PDF document text
    • http://molopafefo.rf.gd/jexatakudetoxeb.pdfIn PDF document text
    • http://werolalijatet.rf.gd/conjunctions_worksheet_for_7th_grade.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_9c72d5cbd36645329b07b8eeafa91c3c.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_56bf67baf82f4558a5cba9b0f5d2d9b4.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_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 5948 bytes
SHA-256: df267e8497c1f054bc9656291eb39b51a9f60bf6e1fe9637cbc6eac69d68cc21
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 12216 bytes
SHA-256: f205e2ca4e303c32b305906a26525cd178c40ecb6a14fac576138af62a18e369

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