PDF malware analysis — malicious · cfe4ec47e4a19f58

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 05:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 15e42b4969b2f58ba1248b4f7ad42241 SHA-1: e7043a7b331db495db527aa1ad82202fead0ee81 SHA-256: cfe4ec47e4a19f5842c6be1922f28e3bc68ea95ffcc700a3aa759e253b043273

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=negative+words+beginning+with+a PDF link annotation
- http://vidol.nl/userfiles/file/vulozonudezowoxesokukukuv.pdfIn PDF document text
- https://relaxbotanika.cz/ckfinder/userfiles/files/31708984648.pdfIn PDF document text
- https://bharatceramics.in/ckfinder/userfiles/files/genufisorutav.pdfIn PDF document text
- http://firewheels.pe/userfiles/file/ludevilidunalofanebam.pdfIn PDF document text
- https://weeb.nu/userfiles/file/mezowofusumenamowova.pdfIn PDF document text
- http://hoachathoanggia.com/userfiles/file/wapetinirosedimaw.pdfIn PDF document text
- https://fleuriste79.fr/ckfinder/userfiles/files/27190867408.pdfIn PDF document text
- https://media-get.ru/userfiles/files/19229227953.pdfIn PDF document text
- https://tideandtigers.com/ckfinder/userfiles/files/5014622452.pdfIn PDF document text
- http://dansungsala.com/uploads/files/domebeku.pdfIn PDF document text
- http://innobiztour.com/FileData/ckfinder/files/20210913_332270A86980A634.pdfIn PDF document text
- http://elitsatodorova.com/uploadfiles/file/21446129179.pdfIn PDF document text
- http://czdashan.cn/uploadfile/file/2021091617063673499.pdfIn PDF document text
- http://mgbig.com/upload_fck/file/2021-9-8/20210908062524201708.pdfIn PDF document text
- http://volvo-cars.jp/js/upload/files/bunaruxenexakiw.pdfIn PDF document text
- http://abogadosaguilar.com/ckfinder/userfiles/files/27773594927.pdfIn PDF document text
- http://www.ondebiz.com/userfiles/file/zefili.pdfIn PDF document text
- http://autowassenindex.nl/images/uploads/sopijusede.pdfIn PDF document text
- https://sanaspinler.com/calisma2/files/uploads/zoxiluxuzug.pdfIn PDF document text
- http://elcivan.com/admin/UserFiles/file/pojowigiro.pdfIn PDF document text
- https://aventura-agence.lu/userfiles/files/nulawigomogaji.pdfIn PDF document text
- https://erdemlerkoleji.com/resimler/files/97807380376.pdfIn PDF document text
- http://mathcountsoutreach.org/userfiles/file/xalumojej.pdfIn PDF document text
- http://nppgursaraijhansi.in/ckfinder/userfiles/files/loneraluz.pdfIn PDF document text
- http://registermycompany.in/admin/userfiles/file/tupijolonabal.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_off0000d974.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD974	10748 bytes
SHA-256: `b6b27f52c36eb6e8ebc0b3b62e68cc5d7ec280366ac955e768b8876f82c3b629`
`font_01_sfnt_off0000f1fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1FC	16880 bytes
SHA-256: `b5a275fb5328a148116a05ea1dbeead806096aed49a0e92735c3e6d9e41dca3b`
`font_02_sfnt_off00011d05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D05	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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