Malicious PDF — malware analysis report

Static analysis result for SHA-256 f838431354a6df3e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 00:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 876db328d2bdd6697870dbe248d5427b SHA-1: c0704cfc01ccaca20105c93e9362338a6b75d36a SHA-256: f838431354a6df3e9f226ef863da195556175c6fc5c6a2b889f58b080317f826
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or redirection scheme. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content likely relates to financial instructions, a common phishing tactic. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://scavilecis.it/userfiles/file/7413226790.pdf In PDF document text
    • https://brs.jo/userfiles/files/21843756842.pdfIn PDF document text
    • http://fxlcd.com/upload/file/vagadizagoniguloz.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/zodomowikew.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/garolazejekum.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/toguwarojaxazado.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/56529312164.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///moreji.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/45666782036.pdfIn PDF document text
    • https://avela.md/userfiles/file/rupusezajuxilotozekojo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909070621895785.pdfIn PDF document text
    • http://mcutech.net/files/julunemaguvobifoponuzike.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///jadowutipawo.pdfIn PDF document text
    • http://freewest.at/13793145316.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010949366952.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/59392041838.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/74747433916.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/navode.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/woxovimop.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/87689720208.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/63932872151.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/zetezumawularaperakelaweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+sync+facebook+account+with+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 19740 bytes
SHA-256: 492569255c2b03fc249a112bd1713971935e5e346cb5d5bc09b8c0f202f414aa
font_01_sfnt_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 11052 bytes
SHA-256: 16c9f6bcf38e347fb4544576064eba67b31270da001d2a45f7136def43077b50
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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