Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b3a3c9c7c9936b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 04:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af9d39a463c457e2f22ac7385e1e51ef SHA-1: 415be463e7f923389aa387f9ccb98843955f7167 SHA-256: a1b3a3c9c7c9936ba7f3daea2bb75ee4d3e89bdc668d12ee966d5ea6f09657ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, with numerous distinct hosts and disposable hosting patterns, suggesting an attempt to obscure the ultimate destination of the malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mebco.ru/images/file/69359959671.pdf
    • http://ymjgolf.com/file_media/file_image/file/fegab.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/mamutumiz.pdf
    • http://bajkolandia-leszno.pl/userfiles/file/49431673384.pdf
    • http://dichvutot99.com/webroot/img/files/32410052825.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/tejofefijigarexotagexom.pdf
    • http://charontrade.hu/data/file/56742754711.pdf
    • https://acrgroup.nl/userfiles/file/4670870885.pdf
    • https://daulte.ch/ckfinder/userfiles/files/59751579047.pdf
    • http://farmaciacogliate.it/userfiles/files/94602723529.pdf
    • http://www.hgekc.com/media/userfiles/file/18262132385.pdf
    • http://yuanyoujie.vip/userfiles/file/renugaligovegisezatiwupif.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/99ba0fc63f0f9037b6758562c2946b05/vajiw.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/luwuzogobuliwadomadewej.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/72769532199.pdf
    • http://cerrutistudio.eu/userfiles/files/jozugezupisasab.pdf
    • http://musicincw.com/fckeditor/userfiles/image/lemiwalulowu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=english+treasure+class+3+answer+key
    • 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_off0000d27e.bin
8f62fe7ce70a3d6dcfe55c874c666c64c0572a6e2cd5981ccaf780c4c1673b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27E 17748 bytes
font_01_sfnt_off00010083.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10083 16792 bytes
font_02_sfnt_off0001189a.bin
11876bbb3945ad5bc16cc56e02a038ecb139e636aac2365074c7451611acc0ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 10936 bytes

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