Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3692a3a122a3dec…

MALICIOUS

PDF

76.8 KB Created: 2021-02-26 17:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5d3376f9bc5681c1d594fc9d94eebc74 SHA-1: 2bb3eb6667a8c2334a0e1d3a7ac2a301c8dbb318 SHA-256: a3692a3a122a3dec8d53f1901a737203bbc1857bd29da906fbd53b2f7cc00377
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://midufefew.ru/123?utm_term=lenovo+t510+drivers+download+windows+7 PDF link annotation
    • http://pakirekugep.scienceontheweb.net/terry_pratchett_wyrd_sisters_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370791/normal_5ffcdb11da9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/bifgjhh/66095415995.pdfIn PDF document text
    • http://pomemaxevisuma.iblogger.org/el_libro_del_secreto_de_la_ley_de_atraccion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_600c6fcdbc66b.pdfIn PDF document text
    • https://cdn.sqhk.co/zeritogekuja/hfJMEy0/word_cookies_daily_puzzle_june_10_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_6020531a5ae49.pdfIn PDF document text
    • http://pizibameku.iblogger.org/camerasim_free_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/eASXkih/tujiwizugu.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/wakamosaxamugikamafi.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/icVo8JA/39075254262.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zolasot.rf.gd/rimovezogenukeweg.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/19170700803.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/free_company_letterhead_word_template.pdfIn PDF document text
    • http://vunonam.atwebpages.com/poxuvove.pdfIn PDF document text
    • http://vemusimovoxodan.rf.gd/nomaxomodelesesumu.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/31173505070.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_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 5308 bytes
SHA-256: cfe98c58b788fbe0de5ccd56a25465448733435ae7d59906048c0c550be2205f
font_01_sfnt_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10316 bytes
SHA-256: e240a65fd4944af4bce21b1cd0866fc35adfaa0fef1d21cc73e0fe33aafa5e49

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