Malicious PDF — malware analysis report

Static analysis result for SHA-256 41842609bd1b491b…

MALICIOUS

PDF

78.3 KB Created: 2021-02-17 14:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8734ce7fdce2f8846e94476e4d790c5e SHA-1: ac24c02be6aad82be79d2ce40c4ae6c8e0e8e5c7 SHA-256: 41842609bd1b491b95fd704fad7f8c76eba867c0fea3675fcf69b1612640e88c
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, which is characteristic of phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host or redirect to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure for users to download applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=download+show+box+apk+for+iphone PDF link annotation
    • https://cdn.sqhk.co/sapamine/eciiGS4/41447475967.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/gjihcic/how_to_read_music_notation_for_bass_guitar.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/PjcGGtp/video_downloader_plus_6._0._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5fea24dea985d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fcace9775f4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413701/normal_5fed2bc641a15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_5fe19494e76fc.pdfIn PDF document text
    • https://cdn.sqhk.co/gajeneset/hP0coXd/60249828740.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/mDgfKgg/27625774729.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/miejfjj/best_fold_up_electric_bike_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/gcQxgh0/32336637398.pdfIn PDF document text
    • http://wabitolukarile.22web.org/monohybrid_and_dihybrid_cross_lab_report.pdfIn PDF document text
    • http://pudumalezedokav.22web.org/basketball_live_stream_apk.pdfIn PDF document text
    • http://nafesotarun.22web.org/jubetefadudidewiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_60133449b05c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewilamijalu.rf.gd/medunoteminosofonuvakebaz.pdfIn PDF document text
    • http://fapubogodomeduj.epizy.com/burlodge_multigen_ii_manual.pdfIn PDF document text
    • http://minuwugonobusuw.epizy.com/fesakonazepezixovox.pdfIn PDF document text
    • http://vodadusilop.rf.gd/35875661946.pdfIn PDF document text
    • http://mevonaku.rf.gd/tujupifikuj.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_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5492 bytes
SHA-256: a640219009c05d2aea8cac1853d6129faa1eeff4ee8795c41ed2f65143d4bd60
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 10536 bytes
SHA-256: 8433a494c294a79c164f53b9bb527d1458cda998199db70babd516fb658a9acb

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