Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33d450e3a8c6fea…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 19:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8343cb4eb90f105cda6c2d34b30eb37 SHA-1: 3f3f2c54f4845e0d998b228541692b038b15cdfe SHA-256: a33d450e3a8c6fea691e63a98b8f3db7798bad41eea6874b671d57735cdf87af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a likely attempt to direct users to malicious content. The authoring application 'wkhtmltopdf' suggests the PDF was generated programmatically, likely to obscure its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://oniceh.ru/uplcv?utm_term=how+to+clean+the+internal+storage+of+android+phone PDF link annotation
    • http://coachhouse.info/assets/file/81211696118.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/51179578503.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/jibudazowepelane.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/87437404274.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d4272435f---xalixozozun.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/88007965305.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/siwotaradabebekazok.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/nidetelexukul.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/tobopunalovugom.pdfIn PDF document text
    • http://findacommodity.com/upload/file/koxejovozujudaxowakotozex.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148679a63e7b---6698380763.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80782488040.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/12776812480.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/nadosuninivelopudomer.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/gopesal.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/3343577720.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/bokexujuguza.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/14978846727.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/10599847181.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/zotujiziko.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/56122901689.pdfIn PDF document text
    • 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_off0000abb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 14424 bytes
SHA-256: ad96de84202a199b88346563a44531421895db9e39ec7af2e2912d33cfc9073d
font_02_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10976 bytes
SHA-256: cce5f79c49413e233bdb7c1dc32933e649e1499ecdabd929f5deeb4917121ff5

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