PDF malware analysis — malicious · 25d1d91f713d27d6

MALICIOUS

PDF

99.1 KB Created: 2021-09-09 00:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21

MD5: d782b54720737b7999d7425d9070042a SHA-1: 33e51d2dc601436d3f911769e8737d7f3d37c045 SHA-256: 25d1d91f713d27d619d88cffb55e7a430bccbd7360c9465f07031577f173b9d4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with critical and high severity heuristics indicating its suspicious nature. The presence of embedded JavaScript and a large number of external URIs, many of which point to PDF files on various domains, suggests a phishing or credential harvesting attempt. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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://archism.ru/uplcv?utm_term=dragon+ball+heroes+free+episodes PDF link annotation
- http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/bibezoteronuxefisoguso.pdfIn PDF document text
- http://wisdomtours.net/upload/file/57091911602.pdfIn PDF document text
- https://satellietgroep.nl/userfiles/files/48208313145.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326ebd651af---81547483809.pdfIn PDF document text
- https://ddc-touggourt.dz/ar/files/14704339601.pdfIn PDF document text
- https://seeandhearbetter.ie/img/shop/contents/13851482479.pdfIn PDF document text
- https://funbugs.ie/userfiles/file/17092199270.pdfIn PDF document text
- https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/92249307292.pdfIn PDF document text
- http://biancoacolori.it/userfiles/files/fojazeginadabekawovimutiv.pdfIn PDF document text
- http://massvt.sk/editor_uploads/system/files/72167861663.pdfIn PDF document text
- http://litho-and-co.fr/ckeditor/upload/files/xamosawiladotuvuxijige.pdfIn PDF document text
- https://masihpt1.com/contents/files/83430200734.pdfIn PDF document text
- http://teen.plovdivweek.com/js/ckfinder/userfiles/files/zuzolagomaju.pdfIn PDF document text
- http://theaterbuehne-schwandorf.de/userfiles/file/54119383098.pdfIn PDF document text
- https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0df3fa4a80da57b2dfc5034fbe66eb9/ruvazitajoninurakubaxiba.pdfIn PDF document text
- https://testagenda1.myagenda.cz/pictures/editor/files/dudaluwozeregefo.pdfIn PDF document text
- http://teacherandtraining.com/coj_u/KK/userfiles/files/sizaxodopo.pdfIn PDF document text
- http://omni-links.com/images/blog/file/19276614950.pdfIn PDF document text
- https://bilalyapidekorasyon.com/userfiles/file/zezuxuwujaxored.pdfIn PDF document text
- http://brunagabriele.it/userfiles/files/33707079390.pdfIn PDF document text
- https://vatlieutaphu.com/upload/files/kutaxabusafimizupidi.pdfIn PDF document text
- https://htapigroup3.com/contents/files/togomevigavupenovek.pdfIn PDF document text
- https://mehreganimaging.ir/images/upload/files/858344086.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_off00010e48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E48	24980 bytes
SHA-256: `7ded28140f77cb3d3f722d901fd948e4ac9f2ffc59369f1be008530c62307a01`
`font_01_sfnt_off00014e39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E39	10820 bytes
SHA-256: `f1788e499778014a9507508500a56ab666d043e2053ac36b71195ae490fba0de`
`font_02_sfnt_off00016697.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16697	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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