Malicious PDF — malware analysis report

Static analysis result for SHA-256 94e398a3761c68a4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 20:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3b6a06cf67186c868c7f69aa5c6eda2 SHA-1: 6464ced24489c01f41505f4c1d132f65fc5afe1f SHA-256: 94e398a3761c68a4ce77a82dc3e8d7016e1f3fcb6b5b931dbc490f79f3fbfb18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=how+to+hack+onlyfans+subscription PDF link annotation
    • https://timminsrenovations.ca/file/Zeddq3ZKbLCZPlwd.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/84798536943.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/medenusizotakafopanezoz.pdfIn PDF document text
    • http://allasclub.com/campannas/file/faseviwufib.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/7521797791.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/83019718317.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/67918468503.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/27619205761.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/jedekobipuwepamiji.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/xabikuzajuxuwatu.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/koridi.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/98003297058.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zinuxefevegutowonar.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/73021443391.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/pibavofomiwusase.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/fekutexeza.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xezokafibipikalotugi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lokijevut.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/zenopatuzukawedelorobuxuz.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/kilagetujunoge.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/81212249436.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/20992190465.pdfIn PDF document text
    • http://darec.sk/files/files/figufuwukulodibironabu.pdfIn PDF document text
    • http://castel.lu/userfiles/files/rubozuk.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_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 10968 bytes
SHA-256: 2e6818750212301c790f353e58cd14930726a7550ee63893619d820c8a9963fa
font_02_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 18372 bytes
SHA-256: 450c8bbcae2b4cfb88d2fea1550c267dd37fa49fbeab34bc7b8f230759f7727c

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