Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a80aa1400387ceb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 21:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7cea6249c51569761d18416169aade4e SHA-1: d08191481080f71e8e9276569621940ad35f62f4 SHA-256: 3a80aa1400387ceba373d981ced62bc9ef7e85f350e26171bccb2db9129392c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting multiple PDFs on disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external URIs and the link farm structure strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=pop3+libero+android PDF link annotation
    • http://www.enfersalus.com/ckfinder/userfiles/files/sarewugimi.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/21892401519.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/ladoxenanaxabemowofoseto.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/rerunazozegunerex.pdfIn PDF document text
    • https://kimcert.net/E/file/bonuw.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/39757940314.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sigelifagasibom.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/fonukon.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/70929637993.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161301a462bf78---kuvunireborubetatuz.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109060328272454.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061600246268.pdfIn PDF document text
    • http://szwygs.com/upload/45841487018.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/35892138723.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43107353588.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368f3a0502b---bupidatemu.pdfIn PDF document text
    • http://haki.vn/uploads/files/6745755797.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/fafikemug.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gumom.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/jonuliz.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://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_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 18488 bytes
SHA-256: afcce1b6e413d1f4aaab4e799686a1e5aad4175b9ec356fd93723c55138e07cc
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 10432 bytes
SHA-256: ab340531ddc7603ac9335b2c08dbfade06504bee741991fd89065905c16034e9
font_02_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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