Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb4935b29ee6d15…

MALICIOUS

PDF

109.4 KB Created: 2021-04-01 20:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d0980628779741f281165a80311c1377 SHA-1: 527067176c53531fc6ba639cc2d249093d49b5b5 SHA-256: 5cb4935b29ee6d157073d91c1e5d2284799170fcdc291af97decb3a61584f6a6
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://mezovuduw.ru/award?keyword=cuestionario+de+estrategias+de+afrontamiento+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5ffa996635278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416659/normal_6043ff81039de.pdfIn PDF document text
    • https://fazidojerax.weebly.com/uploads/1/3/5/3/135328618/zejivogip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410447/normal_5ff7d1bb469fc.pdfIn PDF document text
    • http://gitamoravazini.22web.org/38511033926.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372072/normal_5fef368bab9d8.pdfIn PDF document text
    • https://jamolirotiwe.weebly.com/uploads/1/3/4/6/134693152/rojawekotujokekeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mivevusewez.epizy.com/8418854724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5ddbdb-5fcf-4eda-a457-9b9877a0cfad/luronazunabuzozewexobesis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ef3c1b-30f5-4b53-8ad2-84bddecde6bf/dibalavemamarima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c3cb22-e239-4f7c-aef8-9141438f6be8/a_christmas_story_live_cast_2018.pdfIn PDF document text
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_a3fca82a7a7a42c7a6f6a2621e0ea99e.pdf?index=trueIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_19ceab8ca4764e9da877e357ba001323.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5c8079-0da2-4bb9-987f-67099816ce3a/xusija.pdfIn PDF document text
    • http://dawijafedupu.rf.gd/hiv_aids_information_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66134651-45c2-4e38-ac91-e54f88bdf5d8/how_much_is_brandon_sanderson_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fac88b-7784-4aed-9b50-fdc35adaf121/80353737937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f97ea06-f17a-4031-a22e-f8eff49a9e56/23229983631.pdfIn PDF document text
    • http://garapaf.epizy.com/expression_web_templates.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_off00016ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AC5 5232 bytes
SHA-256: 22c1495092dd4df1b02efe79e585159614021f1acb564cd80f59a5cb47a46904
font_01_sfnt_off00017c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C79 12880 bytes
SHA-256: c35d9b2afeb63de3954023469dcdac1456c6dde40f7dd6c81cdf97a3fcfa647a

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