Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd03050aa54abd28…

MALICIOUS

PDF

92.0 KB Created: 2021-03-25 16:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac36f8142346e581c04cbea6a571f7ef SHA-1: 8b0fb07394f8fe675dcf1f6dec09aaa4ef6c7c26 SHA-256: bd03050aa54abd28cc7861e83e0a40c6e9aceae0e3efc5d377b3db3c9db04bd2
186 Risk Score

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://ponafet.ru/123?utm_term=actividad+epileptiforme+frontal+bilateral PDF link annotation
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/969110.pdfIn PDF document text
    • http://dofagagisefukiv.22web.org/algebra_problems_with_solutions.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/11182061278.pdfIn PDF document text
    • https://guvujuxedudekef.weebly.com/uploads/1/3/1/1/131164066/e8dc098d59.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/bluestone_alley_piano_notes.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/3377071.pdfIn PDF document text
    • http://zamowafa.mywebcommunity.org/witutikujerod.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/doxodado.pdfIn PDF document text
    • http://jibinomazovujug.22web.org/bootstrap_4_template_tutorial.pdfIn PDF document text
    • https://milalidit.weebly.com/uploads/1/3/1/4/131437162/37034e7cb4fa45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_904b7955a726449eadbb52cb72b90ab8.pdf?index=trueIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_92de81c623ea472f98fb19025de31c59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeea0791-65ca-43b0-8822-9863ea5bb0a0/how_to_put_the_lid_on_a_power_pressure_cooker_xl.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/jigobifedapafa.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/how_to_make_playing_bar_chords_easier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f58cab4-d20b-437e-aca1-a300f8bf18f1/how_many_calories_in_dunkin_donuts_bagel.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_bcf64e67c21a4ad6ab0e478c848b44b9.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_49cd1c3d679246fe8c024e0625ba099b.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_30f76aa9a2fa42019d723fc950915b85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc0d010-caa2-4204-b8fd-a530e8f79fcc/how_to_be_a_prosecution_lawyer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e95e3a-7e65-441e-bc64-cab519e69be6/78310822187.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_d387d83dc4014b8fac995f538df3c913.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_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 5312 bytes
SHA-256: 94fcfe5b47f5b5ebcbbbc339f75c5d154bf6c6d3517dad19673e721a9fc317c6
font_01_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 12236 bytes
SHA-256: cc356abab59199679b12663f7c1fe5fdcc305d1e389368c3cfee554f13a4f461