Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5837a9cbb7ef8f…

MALICIOUS

PDF

78.0 KB Created: 2021-01-07 16:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b6808780f69af4ddff48ee195db44e99 SHA-1: 3fed493f374b5a947bbc9c4a1cfb11f726242c1d SHA-256: 7b5837a9cbb7ef8f45628a997b4f1f04d89c3bc890a39059cbf32db26d4552cc
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the presence of numerous external URLs points to the document's role in redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=improving+your+relationship+for+dummies+pdf PDF link annotation
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/ef6db216a9d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fd88086607e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8d8eac9e319.pdfIn PDF document text
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/nurev.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/fulofaja.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/09db4504-f8f7-45c5-9398-fa60adcf0dec/fenesofobetadagabafod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b7b0d3-92db-4e68-8ece-a16f3df78968/74281008137.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/spring_resttemplate_set_auth_header.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8afd7532-b52d-4723-bc6d-73bfd301aa00/beneputogonusapatosoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829d0657-ee1a-422b-b072-e4e73a6103b0/bunijodetabijudobuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/algebra_worksheet_grade_9.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_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 5556 bytes
SHA-256: 558c58ccd8b0961caec2d968a668a2206d5708e3e04e00b243e62611daf86b97
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10384 bytes
SHA-256: b3228e05b1d9acd236ba8b7bff13020ba09f104991e774cb215655f9c756edca

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