Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad85fa6327ac4a13…

MALICIOUS

PDF

69.2 KB Created: 2021-10-06 11:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00aebc03784ee05a29a876209393f2e7 SHA-1: 98357f533da42aa281640e55acbadd1de9f92a5a SHA-256: ad85fa6327ac4a130966264a006aceff9c14df46fa15d5681a0d4d575c52f192
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution campaign. The PDF's structure and the presence of external URIs indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://drafthe.ru/uplcv?utm_term=what+to+do+if+your+boiler+is+leaking
    • http://khautrangkhangviet.com/upload/img/files/61587831838.pdf
    • https://sistemagestiondpr.co/userfiles/file/97448445202.pdf
    • http://dar-tom.pl/userfiles/file/pilutuxetakimizavumi.pdf
    • https://sonntag-immobilien.lu/userfiles/files/7370780446.pdf
    • http://asqcert.net/files/files/20459714394.pdf
    • http://tsuiteru66.com/userfiles/file/zukizewuj.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/69781036864.pdf
    • http://podlahypilat.cz/admin/file/66434727713.pdf
    • http://bluecars.pl/userfiles/file/napofesejetijapitido.pdf
    • http://ohdiabo.net/images/ckeditor/files/xurobawamaraz.pdf
    • http://craft-personal.de/userfiles/file/15231917145.pdf
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezotuferakufigitizobasa.pdf
    • https://planet-pvc.com/upload/files/52350132324.pdf
    • https://shturnev.com/files/foFKED/file/tavoba.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/guzozipizobifibe.pdf
    • https://huuphongplastic.vn/uploads/images/files/fisudenubalezobosukew.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/70381099662.pdf
    • https://cuacuonbentre.com/upload/files/kotokozigukawo.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/55870941546.pdf
    • https://z87992961.com/upload/files/20211006004618.pdf
    • http://vanlysecurity.vn/vanly/album/files/69306503349.pdf
    • http://hotelniagararimini.eu/userfiles/files/35275759786.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_off0000af8b.bin
05e276fa8e4c840b082d39307acd2425bf980e0788f396cf02b7475b02a10f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8B 15032 bytes
font_01_sfnt_off0000d55f.bin
f17625a1e9e54070d14f7727261e4e268f04886a0243cac4dd0806afb1f2f366		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 11072 bytes
font_02_sfnt_off0000eef4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 16792 bytes

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