Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd37983ed43fa42…

MALICIOUS

PDF

78.3 KB Created: 2021-02-27 05:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c572a5e730ba42c025815a105ed8c172 SHA-1: 5cc285e0075305a41f3874bcaa21a64528865ab6 SHA-256: 5dd37983ed43fa42e955a680434737274d9552ec14cf500b219d1b3cb1e79cf9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The document body, though corrupted, suggests a lure related to a product manual, likely to mask numerous embedded URLs pointing to potentially malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

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://jottigo.ru/award?keyword=imax+b6ac+dual+power+manual+en+espa%25C3%25B1ol PDF link annotation
    • http://woxuruko.medianewsonline.com/martin_luther_king_acceptance_speech_summary.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/virtual_lab_the_cell_cycle_and_cancer_worksheet_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/hhzgiai/29045910045.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/hitchhikers_guide_to_the_galaxy_movie_stream_free.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/aheI2HY/riparatorituvegedusiw.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/manonoruzax.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/iQjcmif/12980828549.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/niwumesi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5ffb69c4c85f9.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/xh9fmgi/checkout_51_gas_rewards_grocery_cash_back.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/newum.pdfIn PDF document text
    • https://cdn.sqhk.co/vevajewez/hbSnij1/photo_on_birthday_cake_price.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/hYiiifg/sasoreg.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/gefumuvafosodirovebalasa.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/jd2rjdF/64321695216.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bifovigavij.myartsonline.com/68699202671.pdfIn PDF document text
    • http://sidakofonol.epizy.com/ammy_virk_new_song_record_bolde.pdfIn PDF document text
    • http://pegowalinasaduk.rf.gd/installation_of_church_officers_litany.pdfIn PDF document text
    • http://sirulumen.rf.gd/7._2_graph_exponential_decay_functions_answers.pdfIn PDF document text
    • http://walefofu.rf.gd/haematology_mcq_with_answers.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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 5820 bytes
SHA-256: 73607182fc64d30f6ec5112a319acc3637646a115bbb9e15036a3ae69dc899b8
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10524 bytes
SHA-256: f4457d387b64abb037d38720644676d24009e5937eabadd3e069284fc568da20

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