Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90d58b2b294b5a8…

MALICIOUS

PDF

76.2 KB Created: 2021-06-01 13:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 626dccda9317481ec23e415faa9abdd2 SHA-1: 7fd49086cbd8df07ff0cfe0e31fa80a256e4cf95 SHA-256: a90d58b2b294b5a8902ef549f6af993795ecbdcb9b71f6fc2815dfcb61997edf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by multiple heuristics and an ML classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

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://medvor.ru/pbw?utm_term=are+nightmares+a+sign+of+psychosis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5fe41f9d19581.pdfIn PDF document text
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/rebaguvixin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448328/normal_6062b1a2b0d58.pdfIn PDF document text
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/2440445.pdfIn PDF document text
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/8524078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_6017b10a6258f.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/metawejutugowomowad.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/sixudefe-zopexomuw-mitivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410989/normal_60568d2dbd701.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453719/normal_5ff7adbd55d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_602b3c5f47481.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_5ff9d8e3d39fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_601d553311405.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/199b225d-c519-4563-8603-2dadc8110ee0/how_do_you_describe_heart_rhythm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51032a6e-df65-47d0-b7db-a528560dea02/kenmore_series_100_washer_not_draining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/444b606b-44f5-4528-a31c-c113a219bae1/bageliritisakalipeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069400f5-3b33-4baa-8151-e88d80c733e4/sinavid_carta_de_no_afiliacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f4368f0-5757-4658-b41e-c7eabd55ef4d/what_are_the_requirements_for_a_learners_permit_in_florida.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_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 5488 bytes
SHA-256: 20cf3d990f6033a5c8c320e85efa8d996e97e3228b2a5789cb3bb89253e961c7
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 11024 bytes
SHA-256: fda79796becb685ece0b6327853784aa0413d2a29b8258e8b0f22d71948a0d4c

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