Malicious PDF — malware analysis report

Static analysis result for SHA-256 c271bc94828e0647…

MALICIOUS

PDF

87.4 KB Created: 2021-09-11 09:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49efd28068a2075c135f3b44288a5b92 SHA-1: c6b358fc740196c44b972f1883959590e09fec57 SHA-256: c271bc94828e06475f49cad30c944068abcf5aeb748a957df6812f8feb421dbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute malware or conduct phishing attacks. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the link farm nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zmiz.hr/userfiles/file/tesodovosubavur.pdf
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/vojugirimokojexex.pdf
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/begikizubonevivasix.pdf
    • http://debeleven.net/UserFiles/File/23636346160.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/fikexoke.pdf
    • http://www.travelwithtaangoo.com/img/file/legovonixadipajikud.pdf
    • http://entryexpress.online/chapter_images/files/zomajazufupirixuxexu.pdf
    • http://seteo-dechets.com/images/file/pevaworexonaxupifaxolaf.pdf
    • http://cermak-expo.cz/data/files/file/37263970394.pdf
    • http://princeverma.in/uploads/files/21332981992.pdf
    • http://studioriboldi.eu/userfiles/files/17029387106.pdf
    • http://ammk.sk/userfiles/file/51442776114.pdf
    • https://somogyplusz.hu/files/40110240845.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/pirijurol.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/72954861057.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/24251900241.pdf
    • https://oxi-dental.ro/imagini_ws/9315686899.pdf
    • http://abwingssuffolk1.com/uploads/files/60525947808.pdf
    • http://sacmacbook.net/userfiles/file/xexagoginad.pdf
    • http://sydjpg.com/images/upload/file/20210908_145409_171.pdf
    • http://educasters.co/ckfinder/userfiles/files/xidab.pdf
    • http://sinproval.it/userfiles/files/10076548812.pdf
    • https://kolbandibileklik.com/resimler/files/jodojifadol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=malayalam+movie+android+kunjappan
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f002.bin
f65a4f47b9dbf746f17aacc8ee5921b0be378738347f8ca4931ead641950b1f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 18148 bytes
font_01_sfnt_off00011f27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
font_02_sfnt_off0001373e.bin
31affc14be44ce62e42c901875a1a8ad37631223ca730efc15ea763aee98ea43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1373E 10784 bytes

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