Malicious PDF — malware analysis report

Static analysis result for SHA-256 c140ab866f5f7275…

MALICIOUS

PDF

67.0 KB Created: 2021-09-27 11:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9f628f9f262562b19454adff0b25b503 SHA-1: 0dba90d63c880650e941473dadc8d0196f24880a SHA-256: c140ab866f5f7275161d14d7234d0e86ec57a35bf9710c21226ba5741e48fc2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The PDF's structure and numerous external links suggest it is used as a lure, likely for phishing or to redirect users to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://styropapex.pl/userfiles/file/55641706229.pdf In PDF document text
    • http://aktien-analyse.de/images/File/jiselu.pdfIn PDF document text
    • https://architektor.ru/uploads/file/galitaj.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/meduvabunikibesidojidev.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/sujedolozofevizel.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://caythuocnam.org/images/files/towukalozivu.pdfIn PDF document text
    • http://newshop.jp/archive/file/58666192312.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/damaxokilo.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/nuzugazaxazunokuroxaroli.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/sixag.pdfIn PDF document text
    • http://umhouses.com/uploads/files/bimexatulojanusivevugosib.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109091813054598.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/18044598742.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/76858078867.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/33810293812.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_3A51EF061A351F16.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kuvizajesikipex.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141efb2f0fa2---98538661002.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210927_9105EDB28CC72BCD.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/wafutenetowekelolidugiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+is+considered+fast+fashionPDF 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_off0000ab0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 10520 bytes
SHA-256: 45ad2e51e0f81e5dee06ec96ca43aa84ebb8752ea49794bd37ed7dcbe69c9b95
font_02_sfnt_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 14348 bytes
SHA-256: a4d6b5da5af5b484f7320fc7c05e8538e940c8e6f6f47a3ca48d7a6a2521d712

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