Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d498d81073f56f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 11:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbdfc3409c734976c2843b52472aa311 SHA-1: 32aa5c61fbd9904ff79170ba5070d6660724955d SHA-256: 99d498d81073f56f78c4b2a49a343c073f4f38ce197c4effe829977574f0a979
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://duszek-lasu.pl/userfiles/file/86263701749.pdf
    • http://offerseir.com/basefile/offerseircom/files/zopokonavurive.pdf
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/buligasunefasibuno.pdf
    • http://neoneofitou.com/ckfinder/userfiles/files/99112321552.pdf
    • http://hoangnamjsc.com/upload/files/kabotariz.pdf
    • http://banghetretunhien.com/media/ftp/file/fapotazufozofep.pdf
    • http://mt-filtration.com/uploaded/file/82861745261324735b89ec.pdf
    • https://hongdung.vn/ckeditor/images/files/piziw.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/1a58jcnaob9fth781uhheg7lo5/migumudefixizoxaj.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/walawaluronaxuzije.pdf
    • https://ekoelprom.pl/public/images/editor/file/jeludabewafadidibi.pdf
    • http://lexxyin.net/files/fckeditor/file/89529161560.pdf
    • http://jobsandhi.com/uploaded_files/userfiles/files/66037068305.pdf
    • https://newsru.md/upload/userfiles/files/28870800858.pdf
    • http://dush-kz.ru/uploads/fck/file/55975697853.pdf
    • https://www.idd.no/ckfinder/userfiles/files/56244564575.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/78648929187.pdf
    • https://minhvuongthuphap.com/upload/ck/files/80220970401.pdf
    • http://hkbroadwin.com/userfiles/18926189093.pdf
    • http://www.look4job.gr/images/_user_na/file/bovubiwurefi.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8d8q9ivbu52cn7temudckmgkcb/82828071918.pdf
    • http://villa-carlshorst.de/sites/default/files/file/36003389198.pdf
    • http://sinojjacob.com/userfiles/file/54123079650.pdf
    • http://toitureetfacade.fr/data/Files/pukebunipuxam.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sand+excavator+mod+apk
    • 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_off0000c7bb.bin
b133b9896e35f8e726eca3d13bd84c6903afbe555c66c3f882ef94eb0d381bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BB 18544 bytes
font_01_sfnt_off0000f7f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 16792 bytes
font_02_sfnt_off00011009.bin
76ef2aa51cb252a7ac71041311cb04f5a765ec42fbf52a8d76044df54e43ed81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 10704 bytes

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