Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9f4e98ea962dbc…

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 10:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e7f5a64e21a7694fc0474972636257d7 SHA-1: 17d1ec441251c2489b566bfe7f2a10d9515e7c71 SHA-256: bc9f4e98ea962dbcf68ec3c93c3056df1460cd9108522e0c97ad9d7b473e0829
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the presence of numerous external URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=brinkmann+grill+charcoal+pan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494432/normal_600fc0b2ebd85.pdfIn PDF document text
    • https://cdn.sqhk.co/subetudagoli/hijjlHx/zaxabeletuxilukorurula.pdfIn PDF document text
    • http://andyhongdigital.com/tails_of_equestria_download_freetfxha.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/gI1jc6t/57513257645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_6056ac69106a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_600b3eadb9510.pdfIn PDF document text
    • http://bluebadgeform.com/tebexadezeraxerosifad9ugt5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370080/normal_5fff6dedd1fd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_602d2c3e3f75b.pdfIn PDF document text
    • http://smartbright.club/90352840547g5w7u.pdfIn PDF document text
    • https://cdn.sqhk.co/sebidurubuze/3jiAyA5/relic_looter_mask_of_tomb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376611/normal_5fffaa66f4131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404497/normal_60300b6ab01ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_6041162a19a20.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/hf7hik7/horror_movie_trivia_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_600dfe874429a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_6049c1cfd34c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5ff7e64d41c29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_f2f101fc468b42b48d33e0de67cfdbae.pdf?index=trueIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_6204b261875a4fed9713c71fa58ab4ca.pdf?index=trueIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_1e1bdc0a2ea247319f5e30665828bc22.pdf?index=trueIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_d105b07ddc8844068aaaebb616be61f6.pdf?index=trueIn 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_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 5280 bytes
SHA-256: 84233f492b727ba8fc5a412d454d4cf04a537372fc59dae09567767ff9fa5407
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 12156 bytes
SHA-256: e7dc50a6db97e84fb90572d2e1e89148eccc39b48b8e7019a6914f9e22602482