Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8358c272d6a08…

MALICIOUS

PDF

74.3 KB Created: 2021-05-07 09:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4a57be3fb771ecb0f903685f53a7b26 SHA-1: 3f22536d7b8c099865ae85e1367d12718717f6c7 SHA-256: 81b8358c272d6a08bab5c8d4d0e6f801c3074a673e128aac475870364cfdc4ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=are+minn+kota+foot+pedals+interchangeable PDF link annotation
    • http://kozizukexepuf.22web.org/48079126894.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/420117594.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/5866272484.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/VgiVzD9/birthday_cake_designs_for_male_adults.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488580/normal_6052b4a94886e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_5fd3b7826ea3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5fcd7ddd8bf46.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/aHWjb9J/stormblades_mod_apkpure.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/vaxebisapesi/79068425764.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_8856e8f2f2224dc7acd3729235ce7fa0.pdf?index=trueIn PDF document text
    • https://63d876aa-455f-4c41-9c38-50747f3e0b95.filesusr.com/ugd/a220d5_bbe74cd3b7b8484182c4d179db56d6dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/46381851955.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_afde9fb7a17e4b90a66359c4b30e5045.pdf?index=trueIn PDF document text
    • http://javulivaxetotes.rf.gd/lukewur.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/88384224803.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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 5760 bytes
SHA-256: 94d4cb3144fbea12e9bb6bef508a45f01f4dc6d1bf564578f35a89477a722373
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 11044 bytes
SHA-256: d82bdab4a2aaf8b833c0b269508c30d45def7a05175bab14a223938706aff5a9

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