Malicious PDF — malware analysis report

Static analysis result for SHA-256 c826fff3a2c9148d…

MALICIOUS

PDF

63.4 KB Created: 2020-12-24 08:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bf903a6427c60d02eab826dc2c690bb7 SHA-1: e7d1842cce4cc251497b55fe58fda830abb872b5 SHA-256: c826fff3a2c9148de2d58d9d74185b46f5fbee359bbfa473ec87a8371cadd4cc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, many of which point to potentially malicious domains. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting an attempt to distribute content or redirect users. The presence of embedded URLs further supports the malicious intent, likely to direct users to phishing or malware download sites.

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 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.
  • 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://trafffi.ru/strik?utm_term=holiday+doodle+jumping PDF link annotation
    • https://cdn.sqhk.co/zezoxomop/haO9fje/geometry_meltdown_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lukizigerex/7je1rgj/word_crush_level_845.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/hek0ciA/91306662117.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/soxitika_nixexesi.pdfIn PDF document text
    • https://cdn.sqhk.co/vopufepivipe/n7jjPhe/61518452523.pdfIn PDF document text
    • https://lisefemibumosu.weebly.com/uploads/1/3/4/3/134339955/8659590.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/Fhfjchb/funny_hunting_wife_memes.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/0dNMjco/best_free_word_puzzle_games_for_ipad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/54eea6fd-63ab-4a0b-8719-757256886de8/36585299406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37483fdd-3a5f-4da1-bbb5-4d0f817745cc/62948592630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3d60c7-54ee-4ee8-8856-6366209a413e/por_siempre_tuya_acapulco_capitulo_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0111e3-ef82-4be6-973e-aaa08cbb4348/repibizikixas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6a8095-b3d0-4e94-b7b0-d4e6845e6928/excel_veri_dorulama_otomatik_tamaml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dcead8-aaba-4bbe-99c4-3c35788e2b23/pedexopegemapefefuwufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9149e9e1-7a4a-4b94-aaaf-354d7b528b22/vafasav.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_off0000ba62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA62 5144 bytes
SHA-256: add69ac72468021bdcbfbb13f09117b49f9bc14d7c8c5fa25fe1e2a37695778d
font_01_sfnt_off0000cbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE2 10784 bytes
SHA-256: eb860df01c82eb2edaea07fdbfd529a3326acf5b56ece8b3a13bbda05f7a24ef

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