Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17c79a1f0ffb3b5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 06:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b248f8fe03a56ae8695c42c8dd640d2 SHA-1: 498500d89ceb7296ce87d683c7f0a91149599993 SHA-256: d17c79a1f0ffb3b5d9b7cf41cd43101425dda2d2439805009965e3e8bfb9dcf2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. The presence of numerous embedded URLs, many pointing to unknown domains, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://a-pluset.com/userfiles/38055091784.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/60918468612.pdf
    • https://wic-net.com/userfiles/file/gusipamizoj.pdf
    • https://autoroman-service.ro/imagini_ws/farenigomewumipepitajale.pdf
    • http://wingmanplanningdemo.com/userfiles/files/budikawetuboneli.pdf
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/diniduwoxalev.pdf
    • http://favourtec.com/attachment/file/36488314111.pdf
    • http://rgn2u.com/userfiles/files/suduvumupobepanemoluxe.pdf
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/18969106319.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/14789611808.pdf
    • http://kraemer-duennebacke.de/files/file/pedikesimetopiruvo.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/95500315501.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210918_CBE2372A7BA7EFD0.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/84345721232.pdf
    • https://jokerprod.net/userfiles/file/vadivila.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/60151919816.pdf
    • https://artasedanasingaraja.com/uploadfck/file/71834325016.pdf
    • http://ansonseatery.com/uploads/files/17489146963.pdf
    • http://highspiritsmusic.com/ckfinder/userfiles/files/kijaxo.pdf
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/namivilimu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614393ffc4f5b---34178680485.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/wetox.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/gomodatoz.pdf
    • http://capitaldanceacademy.com/userfiles/files/20214297825.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210914_A6F6ECF2EB075ADF.pdf
    • https://dpengineerindia.com/admin/userfiles/file/34370892722.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=star+walk+2+night+sky+view+and+stargazing+guide
    • 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_off0000dec3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
font_01_sfnt_off0000f6da.bin
3042bf8597c7727efb854263295190bc06859a6d54238a720749a12546d539ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 11120 bytes
font_02_sfnt_off000110a1.bin
0ab428ed34df2a0ef52eecfa2b8fa59d6c9c9e527e26f2e24da50fbbcdf59c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110A1 18532 bytes

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