Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7e8e054f63832b…

MALICIOUS

PDF

73.7 KB Created: 2021-04-30 01:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4349005ffa164452627fb345f5dbf1ee SHA-1: 0cdcb8b5edc58ceda04b00860a8fef5abe1b272b SHA-256: ae7e8e054f63832b069069b3cb272728d148987dd3ddc0f83fda9f3ffda6d80a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=what+qualifies+as+wrongful+termination+in+california PDF link annotation
    • http://waresumozaxaxew.iblogger.org/basic_english_words_for_beginners.pdfIn PDF document text
    • http://hesap-al-sat.com/jibifofegidudwphh.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/LggaQjg/afterburner_game_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ieAAJL2/arizona_state_parks_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/kezagajasiw/K1Cjhxu/green_neon_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/gupetipek/egfJjep/lezatenasawalisiz.pdfIn PDF document text
    • http://idealica-italiaoficial.site/26296275725z4iot.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/ehhm2gg/kubigupi.pdfIn PDF document text
    • http://max-lifting.store/18657617886uckec.pdfIn PDF document text
    • https://cdn.sqhk.co/bujugasefoli/iIYLKib/dopajixegowisopiru.pdfIn PDF document text
    • http://nufubararojafe.22web.org/cambridge_dictionary_advanced.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/ifgcje8/60723532232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_60157ec7ae875.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/fhgggge/menikakusopipiduzowikenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_602df7b7a02d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fdca95dd3f0e.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/disuwogadir07o8q.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/o4jdhjh/kirodibuvakagojapunime.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/RNlRFhd/velosiramefajabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://putojeferef.rf.gd/edit_files_free_windows.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/53244483297.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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 5524 bytes
SHA-256: e281271a7e9a087eef32256830e3989d33db5839a293571ad74c7503fa1a810b
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10408 bytes
SHA-256: a1afea5c73045bf9a8f5a5e918b3457e8d08c3210654890d57a821cf82007b44

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