Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2a362025656848…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 13:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb9d5d0316a41ef1b5878985e4f2d1f4 SHA-1: fb33b35d1a1d6d62e8d0595a5a4243ee03dd5de6 SHA-256: ca2a362025656848fdf7d0029d717b77b0ca8343fbb6cc5cfb91f8fdd6ea0337
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 point to suspicious domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ristoranteyuri2.com/userfiles/file/16811487163.pdf In PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90858098748.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/678faa8c56077beef1a7764c276bc685/kelewafajobero.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/69667130467.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/18859184294.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/58442561632.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jorokapafuzakefup.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/nopasakotulolaxixubej.pdfIn PDF document text
    • http://caramelitos.sk/files/33820124598.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/93074373898.pdfIn PDF document text
    • https://sadex.pl/fck/file/65967339901.pdfIn PDF document text
    • http://alltechsro.cz/files/63072340080.pdfIn PDF document text
    • http://mfahk.com/upload/files/27377350332.pdfIn PDF document text
    • http://salt17.com/userfiles/files/ketimuluxadizixesus.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/lutufowejukis.pdfIn PDF document text
    • http://kleiberit.ru/files/file/vinabolonesapalanet.pdfIn PDF document text
    • https://clubon.top/uploads/files/tirulirijigumedazotur.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e5f0eb45---13846637045.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xunuromasi.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/pumemoxigo.pdfIn PDF document text
    • http://etre-belle.su/images/file/dozefidifavase.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/97903143774.pdfIn PDF document text
    • http://nut-shell.net/upload/files/poxowediwuxexunakoxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=things+you+can+do+with+echo+showPDF 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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 17352 bytes
SHA-256: 4b9c3252475ad22565767af84dc42cb83bb4e7a1b2275c1937ee80b8732c7ca5
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 10764 bytes
SHA-256: 8ff14c19f07032a8ad054089459285a09c9ed86e04ff81b99cd7c9ad0533ead7
font_02_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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