Malicious PDF — malware analysis report

Static analysis result for SHA-256 750466cb73d3feb3…

MALICIOUS

PDF

76.0 KB Created: 2021-03-07 23:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 74358fb2f2ee1f8e5523cf6ce2a794bd SHA-1: deeca446305b976e719b7796739f825a25c7e2b7 SHA-256: 750466cb73d3feb33cfe855e0c8b39e474a500d9eb7317a6a75eaeea2aded172
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

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://crophysi.ru/strik?utm_term=50+shades+of+grey+film+google+docs PDF link annotation
    • http://whalesqpa.fun/topdog_underdog_play_scriptlpbs8.pdfIn PDF document text
    • http://emirofficialzm.com/la_espiral_del_silencioppqi4.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/72542372641.pdfIn PDF document text
    • http://particulieres-societegenerale.best/mercado_pago_mexico3tr2u.pdfIn PDF document text
    • http://pearhaidhr.fun/38805413490o1z74.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/organic_chemistry_reagents_cheat_sheet.pdfIn PDF document text
    • http://dreabling.online/advanced_english_grammar_book_for_class_11-12hwrwo.pdfIn PDF document text
    • http://goproits.com/84375809949ued86.pdfIn PDF document text
    • http://raisinshub.club/conair_clipper_guards_sizesk4kpq.pdfIn PDF document text
    • http://berkeciftci.net/60088298697roq4y.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/nunelanejevevalikesigub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tewapixu.epizy.com/68988942939.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/razer_blackwidow_ultimate_key_layout.pdfIn PDF document text
    • http://lisowinuxofifok.rf.gd/rare_human_diseases_list.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_53148b7b17ba43ffbf42f4851db84a6e.pdf?index=trueIn PDF document text
    • http://zirutabu.myartsonline.com/cubic_spline_fit_with_natural_end_conditions.pdfIn PDF document text
    • http://wiwutanuxowovom.epizy.com/26426462981.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_c59ff428b27b495da68f8ce7f2952c42.pdf?index=trueIn 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_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 5708 bytes
SHA-256: e8e62bef543f0eb339a2f85c07d44e32f820ff1c139ddd9046e7c9115554bae3
font_01_sfnt_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 10836 bytes
SHA-256: b056ba434384bcbf63c0cc3d0bd227e7d44ac1cc0e82a2f0a4634c6721a9cf55

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