Malicious PDF — malware analysis report

Static analysis result for SHA-256 904073a351866e7b…

MALICIOUS

PDF

77.2 KB Created: 2021-05-03 21:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0889df70cb07c17d0c0ba464a83a567e SHA-1: 22254bc43c0f39fa6463a6c6f3683af9cfbd6a8f SHA-256: 904073a351866e7b569bc537aced4b28c8e291d2e6995c052a779d7b2b1ae3b7
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, appears to be a lure related to English language learning, likely intended to trick users into visiting a malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=how+many+phrasal+verbs+in+english+language PDF link annotation
    • https://neruwutuwi.weebly.com/uploads/1/3/5/9/135960217/fakevavot-wajivemotixa-rewulozufope.pdfIn PDF document text
    • https://wimekigulaz.weebly.com/uploads/1/3/1/1/131163744/2147193.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/gidRhiM/rivarisurogipaxim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_6026bfeac98cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424692/normal_5ff9cb7c66e1c.pdfIn PDF document text
    • https://nonoxatuvel.weebly.com/uploads/1/3/2/6/132681685/1194291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495399/normal_5fd916dfa9ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423431/normal_5fcd3470949d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601381e7d6155.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/jBijjfd/troll_face_quest_video_games_level_32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489740/normal_5fceb154b2958.pdfIn PDF document text
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/785f41f0a.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/tidljcA/move_whatsapp_chat_history_from_android_to_ios.pdfIn PDF document text
    • https://kivifakan.weebly.com/uploads/1/3/4/8/134870172/vafalevu.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/90822936-4866-4679-b557-2fb74cee9ea1/how_to_remember_cube_algorithms.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/zesitabobakowejunomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eafdd5d-f351-4cc0-abbd-374d6bbdad27/34738120279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2203dddf-d506-48eb-a9ef-791889fa12be/kofovuzabuxavomogoxupada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ff8ceb-c91e-4f98-85dd-06475a2c5ed4/fluke_561_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/70662767648.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/vexulopatabu.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/pathfinder_bard_guide_traits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b580a86-3834-45fd-a0c4-de2cbb0df6de/99921618423.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/xebimoxil.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_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 5588 bytes
SHA-256: 7a9b75cb9c5f9203af94d22e065a979c46fac363cb9678dc6ff108e8bb8933f0
font_01_sfnt_off00010062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10062 11780 bytes
SHA-256: 64080d34c67536808ab687fb98ff1c3ae6a30fd3e2cabb625efb8595b0faa928