Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd38237a32ddb6a…

MALICIOUS

PDF

78.7 KB Created: 2021-05-21 22:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3414c5096bf80e6b938fca4034fdab9f SHA-1: 9a188d12ea38521b3130e5cd4a0f180d6fd9739f SHA-256: 1bd38237a32ddb6a13f53004929a30b8b863534a598621ef94927bc7cbe26e39
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, many of which point to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://seumenha.ru/strik?utm_term=support+worker+job+interview+questions+and+answers', indicates a lure related to job interviews. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=support+worker+job+interview+questions+and+answers
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/16e67111fe4f.pdf
    • https://cdn-cms.f-static.net/uploads/4495685/normal_602467750e4a5.pdf
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/5490873.pdf
    • https://pigunakates.weebly.com/uploads/1/3/4/6/134628742/523c36b8cdfa.pdf
    • https://static.s123-cdn-static.com/uploads/4378830/normal_5fdf4f14e90e9.pdf
    • https://takewinedol.weebly.com/uploads/1/3/4/7/134768260/xobewotezetot.pdf
    • https://static.s123-cdn-static.com/uploads/4420028/normal_5fcd02a32d51f.pdf
    • https://cdn-cms.f-static.net/uploads/4444856/normal_605c9852703a5.pdf
    • https://cdn-cms.f-static.net/uploads/4481285/normal_605b885c001be.pdf
    • https://cdn-cms.f-static.net/uploads/4489992/normal_60321e5cded40.pdf
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc8866ad4fcb.pdf
    • https://cdn-cms.f-static.net/uploads/4475866/normal_603dfa87776b6.pdf
    • https://nivunosanogerog.weebly.com/uploads/1/3/4/5/134516177/a1e79656.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gogunabones/17933580416.pdf
    • https://s3.amazonaws.com/tajimipojimo/how_to_make_your_own_tabata_workout.pdf
    • https://s3.amazonaws.com/jarawaxanivu/3287492561.pdf
    • https://s3.amazonaws.com/tesodagiwor/nuwabegupivesizivif.pdf
    • https://s3.amazonaws.com/mipizaju/sivegomarugaz.pdf
    • https://s3.amazonaws.com/napejaxosinages/investigational_drug_data_sheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5bd.bin
8aacb012d3bf38ae5d4f7ea7fd1e6f94648f1ce3c461db02b5434db60dcb97d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 5580 bytes
font_01_sfnt_off000108d3.bin
2dfb935ee76f973c43de07e4b023b9dfdf8cf25815959f4ff2f686b0db6f7830		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10676 bytes

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