Malicious PDF — malware analysis report

Static analysis result for SHA-256 26183deb3aa6b8d5…

MALICIOUS

PDF

68.8 KB Created: 2021-09-17 09:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0ed2ee98daaf522ee08bf10211fce2b SHA-1: 68c71c5daba831ce84d257d593eb22a408d8d864 SHA-256: 26183deb3aa6b8d5fbcaeb7f01b87f88d173a0a542fcf5d7efbab5d776787f0c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure by heuristics, suggesting it's designed to redirect users to malicious content. The document's structure and numerous external links point towards a link farm strategy, likely intended to host further malicious payloads or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://petra-dario.info/upload/datoteke/wobew.pdf
    • http://rigdrilling.org/userfiles/file/wumupubufetepiri.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/65091123692.pdf
    • http://cs-web-design.de/ablage/userfiles/files/48132963334.pdf
    • http://seatraderhk.com/userfiles/49701990271.pdf
    • http://gs-metals.com/filespath/files/20210909085133.pdf
    • http://daisin1977.com/js/upload/files/37170885203.pdf
    • http://artechq8.com/beta/uploads/files/jebesurosenafanifa.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jemkjdlld1ej1jh3f4sbfopovg/jasusoregevilu.pdf
    • https://iwanbim.com/userfiles/files/rekupovobufifadebexazavu.pdf
    • http://pro-roubenky.cz/UserFiles/File/62429674569.pdf
    • https://umutfm.com/resimler/files/25934595712.pdf
    • http://willajarmar.pl/userfiles/file/15746379177.pdf
    • https://editionsitaliques.com/userfiles/file/wepasuzarus.pdf
    • https://ietc-oman.saktoon.com/userfiles/files/sarusoluwikizizebegaf.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/36772085784.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/72926934093.pdf
    • http://numismatika-nbkpdy.cz/userfiles/file/febejipesofa.pdf
    • http://jinsonmetal.com/Upload/file/436510864.pdf
    • http://asupuro.com/user_data/image/file/19618962257.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zexuwozu.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84930187271.pdf
    • http://szintai.hu/ckfinder/userfiles/files/90574495163.pdf
    • http://trieuduong.com/images/Download/vuzazidafekepe.pdf
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/42965254630.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+can+you+keep+cooked+chicken+breast+in+the+fridge
    • 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_off0000af74.bin
ab1763ddc3c088d774651001f070b99129595c9ea5d4f93a21a97aa0f0840e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 14192 bytes
font_01_sfnt_off0000d2a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A0 16792 bytes
font_02_sfnt_off0000eab7.bin
f5bbe2df9b52b63580d1177b151b83cc1a4b7b610b76e78fc5596caad8dd8b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 11420 bytes

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