Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d37296037a9ea0…

MALICIOUS

PDF

75.4 KB Created: 2021-02-27 19:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6453e68a306edf27b35e422fc2bc1924 SHA-1: bebd49f4d5bc1a4603a9fc86c5c88bec757d6219 SHA-256: 62d37296037a9ea058808978ba473fb256466bf1b2537079ae3b2e3e9c97be63
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The embedded links, such as https://seumenha.ru/strik?utm_term=persuasive+essay+topics+for+elementary+students, suggest a potential phishing or SEO spamming campaign.

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/strik?utm_term=persuasive+essay+topics+for+elementary+students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375503/normal_6018186ed5682.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/bYujaTA/magic_tiles_3_ad.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/bijin.pdfIn PDF document text
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/pusitogozadesi.pdfIn PDF document text
    • https://goruxevuretu.weebly.com/uploads/1/3/4/8/134851502/vitowe.pdfIn PDF document text
    • https://felabare.weebly.com/uploads/1/3/0/7/130776415/fivop.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/30Hvjhq/gemetujapofomutedopu.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/zasavubirifuruma.pdfIn PDF document text
    • https://cdn.sqhk.co/medugagoviji/cLgdjh0/68825367589.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/30_day_muscle_building_workout_plan_without_equipment.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_to_clean_nautilus_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/51970005982.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/anglican_shona_hymn_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/86394065110.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_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5464 bytes
SHA-256: 224beedfe8a89849511c77a8b5bf3adf847a9f6abacac25c3d2df25262aa8df9
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10748 bytes
SHA-256: e81d2da69a6e24e154b6e76c5664f330e13822fa222e2151fe35aa02ad714ff1

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