Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b657068d0af518…

MALICIOUS

PDF

89.4 KB Created: 2021-09-21 05:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7c5372e55c071e5e383f21e65be7959 SHA-1: 0b4d2276259322d727455d1e3a7323c3ac3c8c1c SHA-256: e2b657068d0af5183b183f80f69e6f45113167cd4d3e4e78fe0e5880a079b162
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://smidgel.ru/uplcv?utm_term=toomics+18+mod+apk
    • http://cecev.com/stockages/files/17183272423.pdf
    • http://iberia-ex.com/images/blog/file/54830319007.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea8106568---84632856644.pdf
    • http://yomamasushitogo.com/uploads/files/29584511417.pdf
    • http://timandlor.com/userfiles/file/jelovigibaxe.pdf
    • http://kovofilm.cz/userfiles/file/kenixasixikuf.pdf
    • http://mezon.jp/userfiles/file/legepoxaj.pdf
    • http://broadgatecapital.com/userfiles/file/64301859600.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/90998219722.pdf
    • https://cupanghitam.com/contents/files/rorakureromaz.pdf
    • http://samurairamenbar.com/uploads/files/tofekamalonepitam.pdf
    • https://brahmagnanam.org/fck_uploads/file/juxuva.pdf
    • http://startmatbaa.com/userfiles/file/84784258096.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/86101719246.pdf
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/81846545187.pdf
    • http://ptairsupply.com/userfiles/file/57932837589.pdf
    • https://deycaterers.com/ckfinder/userfiles/files/58578711507.pdf
    • http://tzsunup.com/upload/bepaguxif.pdf
    • https://kameramuzesi.com/upload/files/keforinufa.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/792cc021add9e4578b1ae4ba44cb4e9b/19268569808.pdf
    • https://thefertilizergranulator.com/d/files/nawudenupidiledam.pdf
    • http://abwalabamaave.com/uploads/files/xajud.pdf
    • https://ozsersogutma.com/upload/files/xunidazuw.pdf
    • http://optykglowacki.pl/obrazki/files/3114251847.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d641.bin
c9bc08549e34118396335bbec213203b6686d34c72d1ba042169b6a9610c0a92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD641 22812 bytes
font_01_sfnt_off00011084.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 16792 bytes
font_02_sfnt_off0001289b.bin
51af3fe3086a94660b9f315ae713b4f62260fe5ca886b28bf266d2640bf1baed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 10512 bytes
font_03_sfnt_off00014092.bin
c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14092 16180 bytes

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