Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f42894254953fb…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 05:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aba67eb60d0790f79b0cf7a6ee86587f SHA-1: c849af9d89f3281ccb4822633268e1487bc0bd89 SHA-256: a1f42894254953fb3eff6ca674efb905cfeab76c416b584edc7ec5ab59f3eb5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613908384ea4b---58170082772.pdf In PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xupepelevarowo.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/86591827858.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ravatigilesosupigiveja.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/22424299071.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/40500500788.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/xaxoru.pdfIn PDF document text
    • https://phnews.ro/files/file/memifatesab.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/muwirokowoditobu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631015525dusomoviw.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/21766618877.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/domapevuzomosilixa.pdfIn PDF document text
    • http://runhouchem.com/upload/files/94312172462.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/xivavujegivukipivu.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fobero.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/pasodume.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/disobujovulitugidokixo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23766614492.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/dogin.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/00d44124a3c5ed0ce31ac96fe685f84b/46241473420.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/somatoke.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/56433394717.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/11549763684.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/medeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=farrer+park+clinicPDF 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_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E8 10052 bytes
SHA-256: 9f753c53d142211defa9fafac9397e129a6cc9c81f4b53932c8c0475a6457f98
font_02_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 19236 bytes
SHA-256: 0ad1deb21751b05885bf8b3d68ba8797f00fd137f7d7894c5ba1b8ec367be03c

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