Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe21d069fb0155b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-14 11:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad69ca4e748d646644b8185a3584a1d0 SHA-1: c921befe5b73ba5857f097210234972945de121a SHA-256: 7fe21d069fb0155b8e3ff0ae7b2c4c57544b1ec9e0e56ae9497cb37451d4c468
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The high number of external links, many pointing to potentially disposable domains, indicates a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kutscher-customs.de/gfx/userfiles/files/33003427132.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363178370ba---45921283337.pdfIn PDF document text
    • http://safetruck.gr/images/file/91962454112.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///tesuga.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/81625731048.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/40842844387.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/lukafegogofofagibel.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/80614724241.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/mometudojim.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/parezebekat.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/3098673453.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/63145937248.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fipokosovijegiwebaroseme.pdfIn PDF document text
    • http://julianina.de/upload/file/3585145926.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8b4cc20b---55555998370.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/ragivojabab.pdfIn PDF document text
    • https://telorgabus.com/contents/files/14880723253.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/14688455140.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2e9f3d81---20989406317.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/20705306690.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/gukazadokozexemiwivo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/44892243373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=inshot+apk+downloaderPDF 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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 10528 bytes
SHA-256: 4a00915b8af6d1e34cbf8a0c031986f68b3e68a19c4af213cc5e160d114c572d
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 17868 bytes
SHA-256: 5809635496cbdf10abcca09cff8e0ba44c5dcd80e5adc6b5c8bc41ec2922aa9f

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