Malicious PDF — malware analysis report

Static analysis result for SHA-256 34808c6a9a1a3316…

MALICIOUS

PDF

75.2 KB Created: 2021-02-25 21:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8be54ee8f99bae696838c3229e502d6c SHA-1: 4ea802a9b970d60af2dadf2e6aba17045f3cab72 SHA-256: 34808c6a9a1a331604216bae35f19941de8f37a7eaffe59db2c736cfa52507b1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a primary focus on 'https://seumenha.ru/strik?utm_term=why+is+there+blood+in+my+eye', suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=why+is+there+blood+in+my+eye PDF link annotation
    • http://shoop-ff.ru/real_car_parking_3d_download_for_pccpdm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_601d32c4c318b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_60168b548dfa3.pdfIn PDF document text
    • http://tovarzone.ru/7700881638301gp3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5ff4eabc22445.pdfIn PDF document text
    • http://scrlt.xyz/36862266044ki17f.pdfIn PDF document text
    • http://jakor.pro/wikenzk5vh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fe296d5db79a.pdfIn PDF document text
    • http://brumbum6.xyz/40036496695r2nla.pdfIn PDF document text
    • http://mysteps.online/53277574424slwb0.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/rekawexuretowo/crown_chakra_guided_meditation.pdfIn PDF document text
    • http://gazunobopa.epizy.com/best_free_gym_workout_app_for_android.pdfIn PDF document text
    • http://jufulejilola.epizy.com/ceramica_eliane_forma_branco_ac_45x45.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/59928266685.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/bloons_td_battles_free_for_pc.pdfIn PDF document text
    • http://tusajemepo.epizy.com/10733091022.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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 5112 bytes
SHA-256: c3d3e28173457bede63d93986604e1b46c1435dcd89387927381a1c370015baf
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 12372 bytes
SHA-256: 2e73b8ed15c11244dfcdf0770391757d8fed5f832b0dc81f6899ab715e519b66

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