Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7641023667caf6…

MALICIOUS

PDF

81.9 KB Created: 2021-10-13 20:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 49b0dc6e4ed398cdcff5e4445c7d817e SHA-1: 4e1bd839ed44ab510f5c8c9ea48da37a40963234 SHA-256: fd7641023667caf6805671d9aa1a8184c3df5246bf7d363c87ad5cbe79aca297
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by a machine learning classifier as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a redirection or phishing attempt. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 4

  • 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://fong-cai.com/upload/files/pufavepa.pdf In PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/fujijakezukom.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/sagasiwugofonojeleliliwun.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/lunudi.pdfIn PDF document text
    • http://npas.ru/pic/file/tuxexojukozivuvaguxixan.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/dajawexulufosalugap.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/50990000290.pdfIn PDF document text
    • https://longhoang.vn/upload/files/32204488739.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/24050600723.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/3526294026.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/66737000491.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/93113371504.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/xozekoj.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/37702704780.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/xanewotaponifi.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/94370048532.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/52968259878.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/tirimusawideb.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/48670215853.pdfIn PDF document text
    • http://soles2walk.com/data/file/89008159375.pdfIn PDF document text
    • http://sushi-belovo.ru/files/jopawuzovitilesi.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/dirugugawarurefaz.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/rebexif.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/27404706567.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210920153036.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/88369396716.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/lipudedijataxejo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=reheating+risotto+ricePDF 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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 19088 bytes
SHA-256: 0d82386911169984852364bfb3ceca4f43682de1fe104d5798541137418ffd9f
font_02_sfnt_off00012243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 10508 bytes
SHA-256: a50124cf4d87ce45deaf0eb33813c5bd7a1ebe2858ebc13cdcc2f1b7f2efdf12

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