Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8b6f98523f1e4a…

MALICIOUS

PDF

96.9 KB Created: 2021-02-18 01:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 19788a790c0b62046df30fce77f114ca SHA-1: 9d0b62d94d6d150079874a37fe99e526b9a60cbe SHA-256: fa8b6f98523f1e4a479859df46b44787b69e706bc78e425854ac04418400f779
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or malware distribution, pointing to the 'Spearphishing Attachment' technique. The embedded URLs, such as https://jacksth.ru/strik?utm_term=honda+hrx217hxa+parts+manual, are suspicious and likely lead to malicious content. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=honda+hrx217hxa+parts+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387240/normal_6006714140519.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/f5jiijb/product_management_definition_in_marketing.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/jdHDie2/truck_driving_cartoon_video.pdfIn PDF document text
    • http://zufunepel.iblogger.org/cheapest_android_auto_car_stereo.pdfIn PDF document text
    • http://tisiner.iblogger.org/math-_aids_division_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/tjf47tU/hobby_lobby_store_in_michigan.pdfIn PDF document text
    • http://sekitubamonit.22web.org/83023911888.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/rdcXjjK/namijuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dixaleko/account_balance_sheet_in_business.pdfIn PDF document text
    • http://porininiji.epizy.com/concrete_genie_trophy_guide_and_roadmap.pdfIn PDF document text
    • http://goruwon.epizy.com/82073782099.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/castor_informatique_coordinateur.pdfIn PDF document text
    • http://ropasibemufi.epizy.com/37852941049.pdfIn PDF document text
    • http://gexaforagugozen.rf.gd/ayat_al_ruqyah.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/41899390637.pdfIn PDF document text
    • http://foripoj.epizy.com/hose_clamp_size_guide.pdfIn PDF document text
    • http://rixexoto.rf.gd/67440992883.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_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 5492 bytes
SHA-256: 686a2533d08afdf80e3c47070b48f5faa4fe31c0b82a42cc7210d681a00ec844
font_01_sfnt_off00014f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9C 11712 bytes
SHA-256: be96a537ca6436ef7bc4fa8d607c37765393142c4115722b34c460c2f69d8d1a

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