Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a95cd760bca7130…

MALICIOUS

PDF

152.7 KB Created: 2021-01-14 04:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ab2aaffbfb52724c8faa419cd2a0739a SHA-1: 8deb7f8fa0564c095e04bd03a08e943c7df0626b SHA-256: 3a95cd760bca7130e04ad6a36450b65722a093afc9dbc624363cd6753bd3b046
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafftec.ru/123?utm_term=season+of+opulence+exotic+ornaments PDF link annotation
    • https://site-1171757.mozfiles.com/files/1171757/home_design_word_life_game_answers.pdfIn PDF document text
    • https://kijaxezadu.weebly.com/uploads/1/3/4/5/134590125/sasezu_posunagazuliju.pdfIn PDF document text
    • https://site-1207255.mozfiles.com/files/1207255/sql_server_management_studio_2014_format_query.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/liajehh/ninizolekifuri.pdfIn PDF document text
    • https://cdn.sqhk.co/xezexasag/EbiboO1/zofakojomobekifojexaj.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/3252490.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/xidizugozif.pdfIn PDF document text
    • https://site-1208467.mozfiles.com/files/1208467/mevexanexu.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/6599193.pdfIn PDF document text
    • https://migijulomav.weebly.com/uploads/1/3/5/3/135394851/nuvosirutaw_sinovumi.pdfIn PDF document text
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/3404428.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/mikopokudivafuxuw.pdfIn PDF document text
    • https://vigejudekoseja.weebly.com/uploads/1/3/4/5/134518300/bedawoxaxuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mutirexa/apa_format_references_example_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/88785753751.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_off000220af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x220AF 5332 bytes
SHA-256: 259df8709ed0823993272dc7bde98f2c5b3f1c751d473e55ccdf778b8a1b2471
font_01_sfnt_off000232c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232C1 10016 bytes
SHA-256: 546a7806fbe643bb398c8278cad96ab2207d979fc429de0cd5a18c34a14f523d

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