PDF malware analysis — malicious · 73b92b79200b5539

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 08:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: f94c79331f0bbe49a2791e06b3aea138 SHA-1: 081bc8fd3a044e2dfcd17e716910286fe90568f0 SHA-256: 73b92b79200b55393e9c3c5c76d6580df32ef93d8880005480e9c1726c2dc79a

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with a critical detection of 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a high number of external URIs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution attempt. The document body was unreadable, but the heuristics indicate a link farm strategy, likely to obscure the final malicious destination.

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://www.orthovision-lublin.pl/ckfinder/userfiles/files/33093546891.pdf In PDF document text
- https://grouptm2.com/contents/files/74998492103.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5a901d61312fa0baaca891486d200283/budinudamesebisa.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/49430170546.pdfIn PDF document text
- https://tecnicadovolante.com/images/file/47075532642.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wojule.pdfIn PDF document text
- https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ad778672---47966192648.pdfIn PDF document text
- https://lienlacanien.com/img_pages/file/lorega.pdfIn PDF document text
- https://www.douggoodkin.com/admin/ckfinder/userfiles/files/4662302554.pdfIn PDF document text
- http://zge-led.com/luodan/images/userfiles/file/90311309455.pdfIn PDF document text
- https://pet-fashion.ro/mm/file/25681640614.pdfIn PDF document text
- http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jivosubumupofagakawisu.pdfIn PDF document text
- http://3dtechgroup.com/uploads/image/files/fuxavakinajutixunobotir.pdfIn PDF document text
- https://www.sterlingsez.com/ckfinder/userfiles/files/57960912509.pdfIn PDF document text
- https://ikansambel.com/contents/files/josofudaga.pdfIn PDF document text
- http://bielle-srl.com/userfiles/files/47205357448.pdfIn PDF document text
- https://gulfb2b.com/userfiles/file/wivokosolaverululupu.pdfIn PDF document text
- https://trompis-tondschungel.de/userfiles/file/tipogezajemupupemi.pdfIn PDF document text
- https://dichocungtoi.com/userfiles/file/80881828490.pdfIn PDF document text
- http://farmandari-sarvestan.ir/images/news/files/14262624629.pdfIn PDF document text
- http://cateringkieuan.com/uploads/userfiles/file/nubewixebe.pdfIn PDF document text
- http://www.pethouse.es/ckfinder/userfiles/files/zasefevowijobewazuvusod.pdfIn PDF document text
- http://factory-01.com/js/upload/files/dupowixotakilodularazole.pdfIn PDF document text
- https://www.nstoplana.rs/ckfinder/userfiles/files/bivowetedupofo.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=among+us+pc+free+playPDF link annotation
- 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_off0000bac7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBAC7	10828 bytes
SHA-256: `4177c986acd5c8736a7200224fda11060abe14d0d68e5b46e6552a66b40313be`
`font_01_sfnt_off0000d3d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3D5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ebe7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBE7	15616 bytes
SHA-256: `eb3d2251d4fa98d20066892cce42fd81589cd080c86b999838bf8bbd2aa670b2`

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