Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb52d0342a1654d2…

MALICIOUS

PDF

72.2 KB Created: 2021-02-26 22:23:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 742b45090f0e4f25a425452890378831 SHA-1: 0c902cbaf02fd0b2beeb19bfda928f24dab146b3 SHA-256: fb52d0342a1654d2be1ed2c762df6645032db85e0efbc77e0a2997f418a33fc9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The document body, though heavily obfuscated, contains keywords related to performance parts, suggesting a lure to attract clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://ponafet.ru/award?keyword=gy6+150cc+performance+parts PDF link annotation
    • https://gojufepegaxop.weebly.com/uploads/1/3/4/3/134339744/5311286.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/2858442.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/wizibapitamimudemale.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/devoza.pdfIn PDF document text
    • http://electorat.org/procedural_design_in_software_engineering8mjcf.pdfIn PDF document text
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/zunopativedut.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/pixokowejotufo.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/zozadazopuvukow.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/lakadutof/79652251577.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/62272757658.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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 5736 bytes
SHA-256: 268a8c0b4138fa2f1d7512e343742a325e82cfd7af6472abc696e39592979981
font_01_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 10336 bytes
SHA-256: 442cbadbab989c6e37aa89504add6f6d58ba01854ffb34b38b7bef7fad87a486

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