Malicious PDF — malware analysis report

Static analysis result for SHA-256 95ff3131820cc342…

MALICIOUS

PDF

80.8 KB Created: 2021-10-11 03:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eb3d0df4dc498780d4beebe903b7078c SHA-1: 93d40fb71bae28b9b6611cf746b6537317672541 SHA-256: 95ff3131820cc342d9121982402a5c1838851014080ca4429db105ce43ef76f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, indicating a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tattooindex.nl/images/uploads/30317282404.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/zowos.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021100510142295.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/babozewufoworofu.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109230501598829.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/filerirevelupefor.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/987092883.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/japuzefazaxu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20211008011749.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/27291915730.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/towibimonosu.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/87163034314.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/89547034605.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/denojajazizikakisavoje.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/xukogilitefaxulaxejosit.pdfIn PDF document text
    • http://falconltd.pl/cache/file/52034536946.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/93984473294.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/turilotejiwojiw.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/47239342051.pdfIn PDF document text
    • https://sentralperdana.com/file/81530492821.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/3480257390.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/dunuzizuzewirubixatut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+difficulty+of+being+good+pdf+free+downloadPDF link annotation
    • 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_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 11132 bytes
SHA-256: 391bb31c809f2c5e28f5f623b57a7e9ad7aefcb581d50b56c32b076370fa9800
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 18212 bytes
SHA-256: b57b8c0595f675eda3acc7a1812ff5104d1742b4d95b684e8df4cd6274959e7f
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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