Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a08f91e5994a63c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-25 17:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2656f921f93a8bd7322771660088bb2c SHA-1: 29a242813d426986ce8b5e41f6916f73f1b2955f SHA-256: 6a08f91e5994a63c4f6b47e10eae4380631089386de28a203cd775561fc8b9e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to a pressure washer manual, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=ar+blue+clean+383+pressure+washer+manual PDF link annotation
    • https://cdn.sqhk.co/datolabevev/b7uehiM/87404131017.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/glkiijh/37947139217.pdfIn PDF document text
    • http://vumavotanumibuv.iblogger.org/animal_farm_1954_film.pdfIn PDF document text
    • http://katagonubazi.22web.org/shein_dress_size_guide.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/d_d_basic_rules_set_1.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/wegubibodaxofijejif.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/rukub.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/zuwupoxuton.pdfIn PDF document text
    • http://gaxazoxisis.22web.org/3ds_max_2020_help.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/ifcra9n/final_fantasy_tactics_jobs_ranked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipaxoxibiva.rf.gd/28082311208.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/lumare.pdfIn PDF document text
    • http://wetowotupime.rf.gd/xosezojobusosurosijagepo.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_9514aed631a5408da706acfa9844b312.pdf?index=trueIn PDF document text
    • http://bowomufe.epizy.com/89613961831.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_04143839bee248718527ffdc7337eb36.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_b0ebc6c742ba4379840e479c736bda28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03d982b-e9d8-484c-b17a-05fc2388e979/fenabanufawikipamepu.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_b8af02eaefde4fad97455acf351eaeb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8193966-aaea-46f3-b6e8-172881919c65/dinogerozis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4340f645-5ad0-4672-8f73-88827639bcd7/50885359739.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_a91dacd57b25437d8e1839d8269dcb3a.pdf?index=trueIn PDF document text
    • http://piwefijegiv.epizy.com/99433842098.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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 5752 bytes
SHA-256: 2bbb6bd9b56e74dba9e8697fa3bde8f8484d82f69ad89a19abf2f278c106c3a7
font_01_sfnt_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10656 bytes
SHA-256: 6829a96ab83de071fabdd01ed58a68556f4d37043bfe6628b96e8c3dbf3c9f9a

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