PDF malware analysis — malicious · d35ac6e73cffbaf5

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 18:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: e88f8a022a066ec378b1397f44f47d32 SHA-1: f9c700a7b7905b420cbb0c2368306f1c636bd30d SHA-256: d35ac6e73cffbaf57b045cc276da973944d55f616eaa0b7a58e677ff5eda905a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it functions as a link farm, directing users to numerous disposable domains, a common tactic for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://coretry.ru/uplcv?utm_term=pro+camera+settings+android PDF link annotation
- http://sanyosushiglendora.com/uploads/files/lifurerepobojoba.pdfIn PDF document text
- http://czechnews.cz/userfiles/files/zewurokovadorexelafadarav.pdfIn PDF document text
- http://kammed.com/userfiles/file/62156976254.pdfIn PDF document text
- http://instalace-charvat.cz/userfiles/file/ritot.pdfIn PDF document text
- http://centrlita.ru/archive/image/file/89353862206.pdfIn PDF document text
- http://location-appartement-venise.com/italie_documents/files/tefusopepumemab.pdfIn PDF document text
- http://pivotal-technologies.com/userfiles/file/mizazusebanodanukakor.pdfIn PDF document text
- http://novichiha.ru/pic/file/49469797429.pdfIn PDF document text
- http://tid.vn/upload/files/pedifutivil.pdfIn PDF document text
- http://sbmhavacilik.com/userfiles/file/5083249044.pdfIn PDF document text
- https://imihwa.com/uploads/image/20210901/files/20210901131628.pdfIn PDF document text
- http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/96353613345.pdfIn PDF document text
- https://sfasg.jp/js/ckfinder/userfiles/files/25325621532.pdfIn PDF document text
- https://coopinproject.eu/ckfinder/userfiles/files/jogosamevowi.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb619b4dc7---nijolosefejazaba.pdfIn PDF document text
- http://dsraxys.com/uploads/xozudixan.pdfIn PDF document text
- https://renesens21.com/ressources/upload/files/26183786161.pdfIn PDF document text
- http://kleinschadenexperte.de/userfiles/file/42395776869.pdfIn PDF document text
- https://elsa-daulte.com/ckfinder/userfiles/files/zakusorefapiganatebuvak.pdfIn PDF document text
- http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xatujaxedegulumifaso.pdfIn PDF document text
- http://winterwonderlandzundert.nl/uploadimages/files/62594789462.pdfIn PDF document text
- https://tatvan.in/userfiles/file/zeziwumojegoxe.pdfIn PDF document text
- http://stardentalcare.org/userfiles/file/54680251206.pdfIn PDF document text
- http://alothongtin.com/upload/FCK/file/tevasiredutidagibi.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c468.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC468	10668 bytes
SHA-256: `afb4a516b2a2490f9a0d6317227bc8bbc39842f4d9d5017ee5ec8433d22a67e7`
`font_01_sfnt_off0000dcab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDCAB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f4bd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4BD	16612 bytes
SHA-256: `d5ccf210184e9728da435099a1777b423ccc2ef5e63149d0c61a3c2db03c8995`

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