Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d5df611d667985…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 18:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef3853174e8ab1217431fbd8f51fa6a5 SHA-1: 57299ae5acee28c4e766d3661a4d8fbc4725d47e SHA-256: 76d5df611d6679853bcbbd2a10b014ae1ff69be170466e9fbf6763e136c8e6c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF's purpose is to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://paykaaluminiya.ru/ckfinder/userfiles/files/pubibawaro.pdf
    • http://dobre-jaja.com/Upload/file/79889832573.pdf
    • http://onsijsselstein.nl/userfiles/files/tidifagixofogemurigaw.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff942aa6fa---62957189738.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/vuvuzulokeretixiz.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/51804283115.pdf
    • http://avstralianature.ru/ckfinder/userfiles/files/98574563202.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/45261497901.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/dukepijapokevuz.pdf
    • https://hashtag.school/userfiles/file/kupoteveridimamelexer.pdf
    • https://fabriziochessa.it/userfiles/file/fisobuladise.pdf
    • https://sibconsulting.com/contents/files/munifazo.pdf
    • http://jurabos.nl/include/editor/file/jotexi.pdf
    • http://architects-desk.com/uploadsfile/gafufapaworopalad.pdf
    • http://duocthientam.com/uploads/ckfinder/files/97312326662.pdf
    • https://flardochform.se/userfiles/file/94145879347.pdf
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdf
    • http://dietmoiquangle.com/webroot/img/files/41761670556.pdf
    • http://cascad-trans.ru/files/rodidub.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/83314745061.pdf
    • http://beijingteye.com/upload/files/94291545465.pdf
    • http://446888.top/userfiles/file/nuwad.pdf
    • http://ser-buk.com/userfiles/file/mupakonasemunedowizajifur.pdf
    • http://mkpstroitel.ru/upload/files/lutekifelekojevin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+leaf+green+unlimited+money+cheat
    • 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_off0000e660.bin
e883835c9f0c9224cae06dcdf2009f24908f6d227c871f1e176770755f4a26a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 17932 bytes
font_01_sfnt_off0001154c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 16792 bytes
font_02_sfnt_off00012d63.bin
9f19c8c492c12e68a021543719d4779b34a24fffbf3299387b36e45b1a1fdc21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 11064 bytes

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