Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc3fdb4e3df21f2…

MALICIOUS

PDF

76.3 KB Created: 2021-05-15 13:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fa2286e34eecae6133802576aeee0a4e SHA-1: 56f039e66cf4eb513cf827b857b7a24ab8f58db9 SHA-256: 0fc3fdb4e3df21f27f558049e94efa432affae3680269049e748fa9599ae664d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains a reference to 'motivational speaker for high school students', which likely serves as a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=motivational+speaker+for+high+school+students PDF link annotation
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/desazizis.pdfIn PDF document text
    • https://likosevatifipol.weebly.com/uploads/1/3/4/5/134584064/55f44.pdfIn PDF document text
    • https://redulexaxoxega.weebly.com/uploads/1/3/0/8/130874010/54f183f98e503.pdfIn PDF document text
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/e43c0b.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/gapone.pdfIn PDF document text
    • http://thailandlove.site/why_is_my_kodak_printer_printing_blank_pagesswq1e.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/wixakajojodek_tivodov_xorixuxe.pdfIn PDF document text
    • http://bajoreto.sportsontheweb.net/adjective_clauses_with_prepositions.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/uptet_answer_key_2020_primary_level_download.pdfIn PDF document text
    • http://sevosegopuro.iblogger.org/37563322272.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/agricultural_meteorology.pdfIn PDF document text
    • http://lavkavkusa.store/lewigosul1s3c.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/yhficHA/82574940227.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/lisumetobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/fY4jjkJ/dumijovune.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/2d881aae7e1a655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zelubosomud.rf.gd/fixumomukexa.pdfIn PDF document text
    • http://gurevome.rf.gd/59175168549.pdfIn PDF document text
    • http://ruzojonawa.epizy.com/attendance_allowance_sample_form.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/romantic_questions_to_ask_girlfriend.pdfIn PDF document text
    • http://rakejobik.epizy.com/number_tracing_worksheets_free_printable.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_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5548 bytes
SHA-256: ef3debf8ec21c442f173d5d6350d123f033bbc2dafb479869f212fef902b564e
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10340 bytes
SHA-256: 49fd6f55be89a3a0c3dbe1702eacce0d4b47fa696cbbc14e8a4102723ed86219

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