Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5a025c2e736f1e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 07:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c3126f219f6ebdb00fd765c458bf3c0 SHA-1: 53afc60b1938ad9d13662e462a45da67fb8fb1ee SHA-256: 5a5a025c2e736f1ed0fff51ab70513d3094bf618443aa28c0de07717c82681ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://pixomot.ru/uplcv?utm_term=download+filmorago+full+unlocked
    • http://www.tomasjelinek.com/img/pub/file/puwesupeteged.pdf
    • http://cokhilegia.com/upload/files/kaxumazafapoxaliru.pdf
    • http://revize-elektro.info/UserFiles/File/rutaralusewovafifetom.pdf
    • http://fnathservices.com/upload/file/32231326552.pdf
    • http://marasintl.com/public/ckfinderuploads/files/luvetetexafigagonadiw.pdf
    • https://thehouseproduction.net/file/66610413910.pdf
    • https://mimpishio2.com/contents/files/xomexetufime.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1e2435ca0eda3031302be35d4d579f89/6999448166.pdf
    • http://neo-net.info/giganet/files/file/87199996674.pdf
    • http://retrolondontees.com/userfiles/file/wekaravemubelonigatojil.pdf
    • https://olterus.com/contents/files/velepexodigezipalu.pdf
    • http://energywork.pl/userfiles/file/87555864106.pdf
    • https://monographie.com/ckfinder/userfiles/files/22891880101.pdf
    • https://produktybhp.pl/pliki_user/File/34953927997.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613809ff45d8e---45021190766.pdf
    • https://tarsiman.ee/files/file/49396310945.pdf
    • https://aildf.in/userfiles/file/77403999714.pdf
    • https://karaari.leaddeehub.com/userfiles/files/81068746520.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/rijazakigudoveji.pdf
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofarimipasiwulanuxojowa.pdf
    • http://orderkiwicafe.com/uploads/files/butokawobugunonokade.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/63063334810.pdf
    • http://sakuragiramenandsushi.com/uploads/files/satud.pdf
    • http://misosmile.com/upload/editor/files/52211481579.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/tokivugowuluvuxop.pdf
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/vivukufej.pdf
    • 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_off0000b33c.bin
79f5992ca29493483befb997ed41eee00d7ce235fd69bf9ab532eff66e6b94ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB33C 15416 bytes
font_01_sfnt_off0000da39.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 16792 bytes
font_02_sfnt_off0000f250.bin
0530efc8d60ea3027ae0027982c852ce8e60f9dd9195e9c4e856132d8acce14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 10832 bytes

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