Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65b8390ec82d2f4…

MALICIOUS

PDF

89.2 KB Created: 2021-05-02 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3b8e23e0077dfff9b19b765f4cfb382a SHA-1: cd4923eabe3c788ff3fe741228bb057f7121008e SHA-256: f65b8390ec82d2f448782881e2fe4fe95abb77a48dd359ea60a4267394395e13
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=starcraft+2+terran+ranks PDF link annotation
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/3421074.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/somidojamox.pdfIn PDF document text
    • https://kuwujuzavasikit.weebly.com/uploads/1/3/5/9/135985591/9378347.pdfIn PDF document text
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/7195364.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/zutexegokipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_9718d107f3d149c196c55ead0c44246a.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_f8ea75c378ff447b8157ba35cc0cd5dd.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_25017fc514ec47c4865621824df7f6e2.pdf?index=trueIn PDF document text
    • http://rudikagonon.rf.gd/mathematics_in_the_modern_world_book.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_fd511b75d9c74b808e169a6d423c3e10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapelu/61444418416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948915c6-f0fb-456b-9479-45dac9157462/41274150959.pdfIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_572a26432ab742bdacda230526408544.pdf?index=trueIn PDF document text
    • http://kepipejesa.epizy.com/anyone_can_cook_this_94_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d486ee8-64e1-4b0f-be51-718c6ed6a6f9/how_do_you_use_the_rug_doctor_carpet_cleaner.pdfIn PDF document text
    • https://27dd58ca-3bab-4825-b0a2-cb75a9f796de.filesusr.com/ugd/aba4c5_3befb31885664d5181379b8bce17da81.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_68dee8a9c0bb475790e33158be032595.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e424749-34ba-402c-b8d7-78893d24bc8e/zudenenujosidato.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/26459365675.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/my_bloody_life_the_making_of_a_latin_king_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 15624 bytes
SHA-256: c6fce963002c90ec1d4d03f448da1cf4cb60a67154063e960e31287ec5a36490
font_01_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 5140 bytes
SHA-256: ab3cfe7845b060cedffcd6397e222f69b1a9e6b152ad7c936fbbe3bc8c7ad90b
font_02_sfnt_off00012e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E99 11436 bytes
SHA-256: bfe418d8dd9ed69e63d41feddbff4ade75a378a8f2df33f11a253b1a07fbaeaf