Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96b98181c4c3bf1…

MALICIOUS

PDF

72.7 KB Created: 2021-02-25 16:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 429d5e396476196f5ca9fef8afb54e36 SHA-1: aa5236d9b3403c1f39470c1d6bd2140f28e4e99b SHA-256: e96b98181c4c3bf14b19e87d45eb40e710df5da5d2792692d55910e58cc44804
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous external URLs, many hosted on disposable domains like Weebly, which is a common tactic for SEO manipulation or distributing further malicious content. The presence of external URIs and the overall structure strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=blackmart+alpha+apk+download+aptoide PDF link annotation
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/265666ee02c40.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/cff4e1680d8aa.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/dggEr43/xigekigurefubapulenu.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/tisibakuvapunodasuv.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/painting_with_a_twist_locations_houston_tx.pdfIn PDF document text
    • https://romubavopu.weebly.com/uploads/1/3/4/8/134884942/pasawimi-mutenizodeji.pdfIn PDF document text
    • https://poxuweke.weebly.com/uploads/1/3/1/6/131606533/7738369.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/7321287a9caddf2.pdfIn PDF document text
    • https://kinanufojakosek.weebly.com/uploads/1/3/4/3/134350472/9090180.pdfIn PDF document text
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/teriduxeginej_mamimutemerika_jegelopitemonir.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/parevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fdb2964090d7.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/hbjaE2D/linopivifeliv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/48404245003.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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 5340 bytes
SHA-256: 4bd959ee7eea99f36f18723d7ab03658bf5275f6693241febeb57a66411a8ad1
font_01_sfnt_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 10672 bytes
SHA-256: f5502172c94ce3ffd71c18c9b8936e274645efaa4deb1cefe6aeafb04a1767b9

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