Malicious PDF — malware analysis report

Static analysis result for SHA-256 881c9ebe3b6cddce…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 08:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6cc442db9fa2133a017b675f4fa5951d SHA-1: 352eeccdcc746ce3312973e28685de6136c117ea SHA-256: 881c9ebe3b6cddce6b488d364727e55f856dc6175ba50f346839eff54c190ba1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and the presence of many external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hmed.vn/upload/files/57475981955.pdf In PDF document text
    • http://altadirezione-consulting.it/userfiles/files/86278246056.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/51408431925.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/87083020332.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/xareperumaluzupetowoj.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/98518081471.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/woxaragibetoxe.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/29108411536.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/bewafomukonilokatobob.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/12627829335.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/jojepiwadigot.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/82842365356.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210909001217.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/pexapezaxapedi.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/43640925181.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/xamumeginunebesunafe.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61201765378.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/mivediduwajoselinapotax.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/13154599109.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/zawoverunaxu.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/49938913857.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/wabegam.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/jusugov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mech+arena+iosPDF 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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 10176 bytes
SHA-256: 5234056b9ce426a658f6070c21bb9fe4283ee570b59171972276e35c3f278332
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 17844 bytes
SHA-256: 18f09cd2267943d6ed0910b74c1deb0573f6ebbdd2e0f72a4f8e610ef1f594ea

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