Malicious PDF — malware analysis report

Static analysis result for SHA-256 174109cbca0644d6…

MALICIOUS

PDF

77.5 KB Created: 2021-05-28 22:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76dcc3b2384d97cce5e36109d26061db SHA-1: f53193c5cf4a7ca2fd48cd5170fd0041da7af20f SHA-256: 174109cbca0644d6c50d665911e533d1cd1943f0c6e662356f7cb81739e931d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cdn-cms.f-static.net/uploads/4375704/normal_604f3f32e1c00.pdf
    • https://mowoxesabed.weebly.com/uploads/1/3/4/5/134594013/9542380.pdf
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602097f4369ab.pdf
    • https://cdn-cms.f-static.net/uploads/4374968/normal_60613440b8fb1.pdf
    • https://mubasaji.weebly.com/uploads/1/3/4/8/134846322/kokaxoreponosi-kajegazijitito-lilopuz.pdf
    • https://nubugudapo.weebly.com/uploads/1/3/2/8/132814946/figal_xewote_jikonuwozi_xumevufavoj.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_602eda728b6f0.pdf
    • https://jedamebised.weebly.com/uploads/1/3/4/6/134651392/d630f91e5e.pdf
    • https://rikusinifo.weebly.com/uploads/1/3/4/0/134017093/rusaragujo.pdf
    • https://repamepofasepa.weebly.com/uploads/1/3/1/4/131437198/waxuzaxidikuposevez.pdf
    • https://wotujajatedigi.weebly.com/uploads/1/3/5/2/135295120/tenejalule.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=how%20to%20use%20military%20alphabet
    • https://uploads.strikinglycdn.com/files/56590c11-e268-429d-a67e-fce47c2f31cb/mabitavefe.pdf
    • https://uploads.strikinglycdn.com/files/e7e3beca-70e5-4fa2-9b4f-b724dffe497b/que_es_el_derecho_civil_en_colombia.pdf
    • https://uploads.strikinglycdn.com/files/9eb8d6ab-dd8e-4d15-a77d-6cf444cdaf0c/47306264823.pdf
    • https://uploads.strikinglycdn.com/files/ae29997a-1fe9-46f5-acab-521bb17aa6df/22347740641.pdf
    • https://uploads.strikinglycdn.com/files/d1c28dfd-8fdb-4ed5-a656-6d491f3ae469/wosovoxabepijavidurulo.pdf
    • https://uploads.strikinglycdn.com/files/1244175e-c22c-4493-a75b-c95319908093/the_idea_of_justice_and_forms_of_healthcare.pdf
    • https://uploads.strikinglycdn.com/files/7c95d3f6-906b-40b6-b14e-23145376f897/zikumoderatamizilofiguz.pdf
    • https://uploads.strikinglycdn.com/files/9d582560-a4cd-43f4-92e2-f0b31d7772fc/campark_mini_trail_camera_review.pdf
    • https://uploads.strikinglycdn.com/files/c51b564e-7002-42a6-a8bb-d8817e2a8808/12_days_of_christmas_song_lyrics_printable.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_off0000f2a5.bin
359dd2657629066951a23bdb6b82406348ded5529e9ff02798bc0f3f73709f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 5356 bytes
font_01_sfnt_off000104b7.bin
2ffa972d939d7fda72314842a806b780d4de1220205c9c1535474ead7d574f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 10464 bytes

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