Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f587d82ccd5eae…

MALICIOUS

PDF

69.0 KB Created: 2020-12-22 12:16:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6ecc3c12429c4088639647b905604cb4 SHA-1: 15e7ead173bf086bfac8712b61dea3125aad0b34 SHA-256: b0f587d82ccd5eaea9ca5a923561e5ed9921e881a6a2a7615addad4ab82ba23e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, which aligns with the link farm heuristic.

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://trafffi.ru/strik?utm_term=nutri+ninja+green+smoothie+recipes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fce696fa0554.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483088/normal_5faa54d0a9435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_5fd28cf3c3637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478430/normal_5fb267f52bd1b.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/sinadi/blackpink_forever_young.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15d59403f5353fd98fe44/t/5fc805546a2bd913a54f16cd/1606944084992/68692359103.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/alfit_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/kewomivemanakuxage.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc713abaa0dc1643a2f70df/t/5fd65c98dca221526040faf7/1607883928749/zuwanodimopazadawosujor.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/20096786927.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/xhubs_download_apk_pc.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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 5360 bytes
SHA-256: b2e1da27dcf92d30e03bee86a4292accb28011c3cb8ec3001a1af6a47198d4db
font_01_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 10384 bytes
SHA-256: 48e3e1dfc353a254e3f927192c3ffd5ef02db295e12ccdca678f44767ed27af6

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