Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9109be318d727f…

MALICIOUS

PDF

79.4 KB Created: 2021-04-29 18:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cf5f65c40ce2bed3b1c98e0e9f80a30 SHA-1: 29a873ebf4363d3d48c0f67c5b6126c6e702e7f8 SHA-256: 0c9109be318d727f3e5d774774e91be90ec151e707317de76685060086e9a135
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites, likely for credential harvesting or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=simplicity+riding+mower+with+bagger
    • https://static.s123-cdn-static.com/uploads/4404105/normal_5fc76ec5ce168.pdf
    • https://static.s123-cdn-static.com/uploads/4385862/normal_5fde059fcf6a6.pdf
    • https://cdn.sqhk.co/rukububibon/difYhj4/wesuzuli.pdf
    • https://cdn.sqhk.co/milagaleja/gjfLgsL/tonasono.pdf
    • https://static.s123-cdn-static.com/uploads/4384655/normal_5fc7b497ee3a5.pdf
    • https://cdn.sqhk.co/kuxaroposa/vgjiiJR/let_s_hit_up_meaning.pdf
    • https://cdn.sqhk.co/galemojubemo/igjixC1/guided_readers_program_reviews.pdf
    • https://cdn.sqhk.co/pigexebobe/Siaijid/ritolovavofudobosasokak.pdf
    • https://cdn.sqhk.co/waxobakal/jfggeFV/pets_word_search_printable.pdf
    • https://static.s123-cdn-static.com/uploads/4406776/normal_5fde385d2571e.pdf
    • https://cdn-cms.f-static.net/uploads/4459917/normal_6069eaec32164.pdf
    • https://cdn.sqhk.co/xamozafi/texvhjp/magic_fluids_pro_1._6._5_apk.pdf
    • https://cdn.sqhk.co/nupozifulija/NDGgjgg/gipegideguzukegatofef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3e52b821-9be7-4ad4-aa83-3e2b6c48306d/how_to_get_error_code_on_whirlpool_cabrio_dryer.pdf
    • https://uploads.strikinglycdn.com/files/e790e0ab-05e2-4366-99f4-54e0cec00d9a/dexovitolexizugitatevad.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_05755bf249a145688b9ee830dad165c4.pdf?index=true
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_4476272aa42e4da8851ec520c987fc36.pdf?index=true
    • https://uploads.strikinglycdn.com/files/555f300e-6f92-4054-8d9f-5ccab8c307f9/6714694853.pdf
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_1669ecaa02f4457dacbab8d31519d060.pdf?index=true
    • https://uploads.strikinglycdn.com/files/676bed96-8d2a-4eff-ab26-bf25cde35763/62848871290.pdf
    • https://uploads.strikinglycdn.com/files/03a9bd77-f8a9-45f0-9863-ef48c1e1fba6/learn_amazon_web_services_in_a_month_of_lunches_download_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f713.bin
0e15d82f1970036a95d2d637ff557778ad5319958d205c0a7fc4a440b7eec49e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 5748 bytes
font_01_sfnt_off00010a8b.bin
b261513a3abd115b3877da90a6c7026e7d48e74626b3f8619a087af5ae4e451b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8B 10968 bytes

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