Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd741ca2408c7b5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-20 14:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9dc562438e11a0ea2dd8b71bcb8eef6b SHA-1: f834b422d0d52336affd4d607febf0a30c80f30c SHA-256: 8dd741ca2408c7b5ad4c7ca945e30418640fc67ad2575dd83e89065d55a7d53a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to host a collection of links for malicious purposes, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://shop-exclusive.cz/userfiles/file/gijavigimusut.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58906994689.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/25040064457.pdf
    • http://parfumerieindex.nl/images/uploads/pukakexuboduf.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ff3529f4c---dipujof.pdf
    • https://biserica-izvorul-tamaduirii.ro/files/73664420086.pdf
    • https://trisyscom.com/userfiles/file/89927618127.pdf
    • http://nanopena.cz/upload/file/dokone.pdf
    • https://luiginoiobbi.com/userfiles/file/kelekonazeruxisiru.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/nibuxupoliwagasukujopid.pdf
    • http://carmakers.cz/userfiles/files/67449854654.pdf
    • http://jarosi.hu/files/file/jumonulerasage.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fumojonanizowakimiwe.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/sesitizuvula.pdf
    • http://masan315.net/board/imagefile/file/gufixinegibewovot.pdf
    • http://brenderup.ro/mm/file/96686344540.pdf
    • http://itagqatar.zajeltel.com/itag/file/files/dulaxuxitisidatisofe.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/saxaregetoxitenemexuvo.pdf
    • http://ysenb.kr/board/file/editor/file/27352101272.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/pudofimubosu.pdf
    • https://nasco-ye.com/uploads/file/rixugekixuneridokanaxa.pdf
    • http://importfoodfair.com/userfiles/image/2021/09/file/92520715798.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rotation+180+degrees+about+the+origin+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D1 16792 bytes
font_01_sfnt_off0000dce3.bin
c7ccda9a6d000f521efaed1e53b8eaedc4ed537aa75a1a277f4dea448386ef47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 17960 bytes
font_02_sfnt_off00010b44.bin
983710713c25c39e3b515bea1c1b6046dd8c3d2f92af3754d503c21c5ec53195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 11324 bytes

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