Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9d61a684f82f4e…

MALICIOUS

PDF

89.8 KB Created: 2021-03-14 04:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 912391cf8356f90ae5094b75e38fa25e SHA-1: ccd6bcd4acc5f479633c994f454afedf6141c49b SHA-256: 8d9d61a684f82f4e992162232132ab9fe58e126aabfa759a1e89940923157d7a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing lure, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/award?keyword=ccna+voice+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379486/normal_6008ee9d43229.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/yQjidod/14130835079.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/ije44PF/moleb.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/JhfjfIJ/richard_dawkins_the_ancestor_s_tale.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/73861234726.pdfIn PDF document text
    • http://gifozuxozud.22web.org/xapudopuzagafomatezuj.pdfIn PDF document text
    • https://vowopazi.weebly.com/uploads/1/3/4/0/134096587/sevopi_talex.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WQcKvgY/cannot_remove_fill_color_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_601a3d4b887e3.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/the_payment_of_bonus_act_1965_mcq.pdfIn PDF document text
    • https://cdn.sqhk.co/jegamaxegev/XINUiiP/mansion_blast_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/ghaDz3j/96414974719.pdfIn PDF document text
    • https://cdn.sqhk.co/zopezepazedo/iiRPhdZ/86561921953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_6036d7f15264f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404512/normal_603e248ead69b.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/volume_formulas_calculus.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/0GOjajg/streamlabs_dashboard_app.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/7aed0a9be76d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5ff4349037eb2.pdfIn PDF document text
    • https://xidifapub.weebly.com/uploads/1/3/0/8/130873728/mikogek.pdfIn PDF document text
    • https://cdn.sqhk.co/nosuterib/lFyDRRO/blank_doctors_note_template_for_work.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaveravezujob.epizy.com/how_do_you_listen_to_new_music_reddit.pdfIn PDF document text
    • http://genufewewirim.rf.gd/catch_and_release_movie_parents_guide.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_off00011fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 4992 bytes
SHA-256: 887e22d8f2096c4225fab6d5e341180d54adb0ccabbf1e60d094d1598c359d42
font_01_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 11888 bytes
SHA-256: 97dcd3ce6390c456584d9591ddf860435bb90275b5ad76e218653f78194d157c