Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2137cb1264fa98c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 00:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 469f3dc9384d14cf8b67d7fe995827b0 SHA-1: b29cdd32984aefa5ff372d1b54bf380b0747cbff SHA-256: a2137cb1264fa98c286569bc3662f596841a2047d116fc191e57cf74156bb97b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as file downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the embedded links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://drafthe.ru/uplcv?utm_term=best+village+seeds+minecraft+xbox+one PDF link annotation
    • https://askisan.com/upload/ckfinder/files/milaxelanefe.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/zisepida.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/70535155498.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/34032096174.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/54992867356.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/nepinemowugije.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/guxopadi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/rurojofilobux.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/xokawetizilukonekupele.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/37430275847.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/bokadapodamuwoz.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109091857323075.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/38273444231.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/41708583387.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73428759440.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/83070285734.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f01e072b---98512577374.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/wemixokalifab.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/89930080808.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/53206274452.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11272441271.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xojexalepamevuseroburavam.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/1671761419.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 17008 bytes
SHA-256: bc2baef735e51cbb05287af672ac5fd4f4799cfb4eeb4aaa1bcbe09a53e0b635
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 11180 bytes
SHA-256: d9de91f2fee4adf14fe16cab4b097eac48a45752158258592d30d5c3a990ecde

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