Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94169859c5099aa…

MALICIOUS

PDF

82.8 KB Created: 2021-09-23 01:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32f352512e90d7d06a4f2d88dda1b89e SHA-1: ba6a486e0f36d9f257a664e8132844d0e197b909 SHA-256: b94169859c5099aa90d15ce508ae65dfa08fa3083e8fcfd69ee60b888d2a0b07
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of external URIs and the link farm characteristic suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=how+to+check+blocked+numbers+android
    • http://goksirkrupskimlyn.pl/img/upload/files/30688677632.pdf
    • http://hsi-international.com/ckfinder/userfiles/files/55683052369.pdf
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/paxuwufiguwanumij.pdf
    • http://ejmk.com/ej/upload/files/xezifibena.pdf
    • http://amy-tsai.com/images_express/userfiles/files/loxofamudelima.pdf
    • http://www.s4b.nl/upload/files/sitewuvozamoliwev.pdf
    • https://buddhaart.in/userfiles/file/fokasujusewekanemimode.pdf
    • https://teamcode.net/upload/files/vijubitobu.pdf
    • https://cahayamimpi1.com/contents/files/20605907583.pdf
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/fuxiforolaluxefejexi.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/fuzofokimoj.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/54146722fbc421ac3c17a55f0b70ac8b/munanat.pdf
    • http://denetimmusavirlik.com/userfiles/file/juvevij.pdf
    • http://hkbroadwin.com/userfiles/gobafatuzorarenuporetowu.pdf
    • http://sushiyaslo.com/uploads/files/remidi.pdf
    • http://sabaispa.net/userfiles/file/61453125566.pdf
    • http://geostudio.eu/userfiles/files/73254255266.pdf
    • http://safarang.com/basefile/files/gapadadojawes.pdf
    • http://madmojo.com/fckupload/file/83551057947.pdf
    • http://mindentudor.hu/userfiles/file/45521157225.pdf
    • http://cosyromania.com/media/file/xebelemubevikadalaritojut.pdf
    • http://licausi.it/userfiles/files/3863327652.pdf
    • http://akcjonariusz.com/UserFiles/file/tabuzigadopasesav.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_off0000dd6d.bin
d11aba2a0be7065e1f2aef06767397ef462667622b19d0ecca0ab441f816ec12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 11044 bytes
font_01_sfnt_off0000f6f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16792 bytes
font_02_sfnt_off00010f02.bin
6526e83c2c5a74adcb0df965960941be47734a3624c85b2374d90ff4b0e0f71a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F02 17920 bytes

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