Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b496388d52d54a1…

MALICIOUS

PDF

73.9 KB Created: 2021-01-12 12:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a845be2685e612f1dae5c216d995e9a5 SHA-1: 9504a7d6a6a96f003cd545026c4f8a1f8bdd1ec3 SHA-256: 9b496388d52d54a1a6913b27d5d33526ad4396ed2959e73c4ad7e52e024cb9b1
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 0.9998

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://trafffi.ru/123?utm_term=study+guide+and+intervention+division+properties+of+exponents+answers PDF link annotation
    • https://mozapimijovami.weebly.com/uploads/1/3/4/6/134661863/febd0a35902f.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/woregex-taval-sonema-fikawadexu.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/6ff0fde42c3.pdfIn PDF document text
    • https://vepibasizux.weebly.com/uploads/1/3/1/3/131380915/d2a9642.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/3d21f99.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/fDO0hjg/blue_cross_blue_shield_of_texas_login.pdfIn PDF document text
    • https://site-1173625.mozfiles.com/files/1173625/58676992856.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/denadixum.pdfIn PDF document text
    • https://site-1172175.mozfiles.com/files/1172175/vewigoponotaxejejujojogem.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/7bxbQod/tank._io_war_multiplayer.pdfIn PDF document text
    • https://xomijati.weebly.com/uploads/1/3/5/3/135329577/786e7b2492049a.pdfIn PDF document text
    • https://site-1173734.mozfiles.com/files/1173734/musynx_ps4_gameplay.pdfIn PDF document text
    • https://site-1176918.mozfiles.com/files/1176918/meridian_157_prologue_control_room.pdfIn PDF document text
    • https://zupudawuliwubil.weebly.com/uploads/1/3/4/2/134265939/6f126e.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/498205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 5484 bytes
SHA-256: bc37b7e913d5c8b561fb82d5bf2052b5771bfc7687981e71a6abbcdf7add3798
font_01_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 10472 bytes
SHA-256: e4c0566257a89da85c647071b5dc876cbe0f58d9a830cd13c649388908f9ea9f
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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