Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2520d052e0828a6…

MALICIOUS

PDF

68.2 KB Created: 2021-02-22 21:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4026cb71bf9460e7345fee65a1c88feb SHA-1: e93e788191c0a176c941ce2eb28d0bac1ea352f6 SHA-256: b2520d052e0828a64837e28d2ddb39100dea7ad3b43db3dfb6ecce84596aef4e
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/strik?utm_term=butterbeer+harry+potter+recipes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490547/normal_6005e14291258.pdfIn PDF document text
    • http://rentline.pro/22184635807qwm2n.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/diaheii/91887115537.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/gjhejji/rowdy_wrestling_hack_mod_apk.pdfIn PDF document text
    • http://uscarins.info/baal_veer_episode_1200_videoex31h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_60272cc35ebe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421339/normal_5ffbe2cacd86c.pdfIn PDF document text
    • http://abzac.me/infinix_note_4_price_in_nigeria0ir6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_600ba442d5fe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5fdd8ca5cee11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6026d108f26c3.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/jazuravazaguz/2220519833.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/danowuxujoxogas.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_off0000ce94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE94 5280 bytes
SHA-256: 98524475b895e6b82a4c52fd0aee65d8ec54de2cf31627bf95fdc1ec4a5aa24c
font_01_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 10444 bytes
SHA-256: 3de96393c6d09aa92d44bb813935ea1d7758dda42ef0865491623550f4128624

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