Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a6169526587861…

MALICIOUS

PDF

71.3 KB Created: 2020-12-30 05:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 424b5736924d1cf9574e5937454c65dd SHA-1: 8935d44a9fe3f651bf24dd7e10177582b5d31f99 SHA-256: 82a61695265878614c2df2a94a6b6779323da4b35170873af5c49a542b1209a2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a mass external PDF link farm, with multiple URLs pointing to Weebly and other domains, suggesting a phishing or malicious content distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=polyblend+grout+renew PDF link annotation
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/2210919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5fbe2b10711f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8ed543f3753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5fb4e14b54b6b.pdfIn PDF document text
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/de22db0b.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/rurup.pdfIn PDF document text
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/fileb-wufojarozo-kagoxidas.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/monavokedono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5fb9cde09c7a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_5fd3b50bccf92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/metformin_lactic_acidosis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/buvosibenagok.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/filmmaker_business_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/lafulezopejidar.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 4940 bytes
SHA-256: 42ff8f3fed22ba6c2344d07538e4ed9777e2575e15527b03fff47e2e2f68b98f
font_01_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 10932 bytes
SHA-256: 384f85d95b52da4042d4ba2725c370812eef487fbcdb1c78640561622c0af020

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