Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc719dee4497073…

MALICIOUS

PDF

68.4 KB Created: 2021-05-05 23:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d4bae16b7f5fa436209c3626e7deef7f SHA-1: 2bcbadbb3d1d71ff08528533829c3149b03b6bea SHA-256: edc719dee449707338bd1e2acfe0ee8a6a11fc310c91055dfae30a5f55f0d63f
146 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, and an external URI points to 'https://botokaw.ru/strik?utm_term=brother+pt+d200'. Although no scripts were extracted, the malformed stream length suggests an attempt to hide malicious content, likely directing users to the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://botokaw.ru/strik?utm_term=brother+pt+d200 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470964/normal_60434366503f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_60423653346c4.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/php_ajax_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5ffc150b7151e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_6047302add650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_603e40321abce.pdfIn PDF document text
    • http://xonigej.mypressonline.com/acetilcolinesterasa_eritrocitaria.pdfIn PDF document text
    • http://xunarepozufuz.mygamesonline.org/how_to_make_poached_eggs_in_a_microwave_egg_poacher.pdfIn PDF document text
    • http://wepisoja.mypressonline.com/learner_centered_approach_to_language_teaching.pdfIn PDF document text
    • http://xejevojesinil.22web.org/76454406705.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/brushing_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5fd178a46526d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_5fdb3ac160d9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c0b3b1-e903-4bd4-953a-1c977fcd449a/11926553586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db15196-78fe-4a18-bfc4-6359ebc11e45/89620147936.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/wopofexovumuxejizigelonem.pdfIn PDF document text
    • http://faxunarin.epizy.com/travel_reimbursement_form_template.pdfIn PDF document text
    • http://muzubakow.epizy.com/givar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0917eaa-3148-4d69-a23d-0a6f8c5115ca/beretta_a300_outlander_turkey_choke.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/51055993529.pdfIn PDF document text
    • http://kizuwopo.epizy.com/pokosajuzutor.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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 4952 bytes
SHA-256: f6dbeae079cad10b47f0c37968615c1adba404c9794b0bc3957a28d2d0117e53
font_01_sfnt_off0000e080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 10496 bytes
SHA-256: 66e7b7ff09870bdc204992337e0df4950f553f44a634fdcfc9a9a9ac08b51dad

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