Malicious PDF — malware analysis report

Static analysis result for SHA-256 851bde7a8b4cf04a…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 15:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcacbf9841fa13a81a0fd1cca2b1b9f1 SHA-1: 6db855ce11860b2739f29f1b91675da76bc20b7b SHA-256: 851bde7a8b4cf04abfe1b0b113b071356d56656c17da0f7efdb6777d251310da
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-based document designed to trick users into clicking an embedded action. Numerous unknown URLs were extracted, suggesting a link farm or redirection mechanism to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://artin-intranet.com/ckupload/files/ximupa.pdf
    • http://stellar.ru/ckfinder/userfiles/files/5590549440.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/33558831032.pdf
    • http://skulpt.in/admin/uploads/file/guvaposuzejirin.pdf
    • http://danchrisjewelry.com/userfiles/file/74933449016.pdf
    • http://irvine.songhakbbq.com/uploads/files/susedat.pdf
    • http://euro-ex.com/images/blog/file/64260160700.pdf
    • https://safetyhanoi.com/userfiles/file/84807081202.pdf
    • http://immopolignano.lu/images/94402437317.pdf
    • http://mecaniquekd.ca/upload/file/27766110388.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/vadetemoruguduwijomejup.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/3122305550.pdf
    • http://yachtales.net/admin/userfiles/files/29718001834.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefaxenibedebirisudetomub.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f458975450b27fce1532362d5a381a06/wiwapud.pdf
    • http://sushinamu.com/uploads/files/95260978126.pdf
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sofilekafabebozuzix.pdf
    • https://pinyardim.com/calisma2/files/uploads/dojokofutesu.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/vuparetaxovetudomipajugu.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/88890091868.pdf
    • http://pobierzplik.pl/uploads/files/jezixa.pdf
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/xeborudariwafelajatene.pdf
    • https://hizlipin.com/calisma2/files/uploads/jineboxejevetirawa.pdf
    • https://skatrip.com/basefile/skatripcom/files/37846366971.pdf
    • http://naoshima-tours.com/images/blog/file/16694118877.pdf
    • http://palirna-frydek.cz/uploaded/file/zejes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mass+number+3
    • 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_off0000b118.bin
3f00a5a7c9760a99179a70d2e3fa27f0a2543a393a96d9bc3654ef6b45b6e6cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB118 10320 bytes
font_01_sfnt_off0000c856.bin
a8d8b9b1117cd3927795d25e84296d0eba5fc86462e4494990dadf8bce3ed6cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC856 14236 bytes
font_02_sfnt_off0000ebd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 16792 bytes

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