PDF malware analysis — malicious · c8e182d7cd345540

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 08:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: 4522e0702167ad052452eb46ad623abd SHA-1: b37120f7a7e8a73fbba4f3c072c853f2ef1fcc9e SHA-256: c8e182d7cd34554032988cbe0478b9710d5fcf4ec2e319816c258c6928b90a34

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, including one that redirects to a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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=year+8+comprehension+test+pdf PDF link annotation
- http://mutamobilya.com/images_upload/files/52832467845.pdfIn PDF document text
- http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/gamajeralevimizoxu.pdfIn PDF document text
- http://bscartridge.com/pic/94253606007.pdfIn PDF document text
- https://cardion.dk/gfx/fckimages/file/zepabexa.pdfIn PDF document text
- http://azizolace.cz/images/file/burokininineloja.pdfIn PDF document text
- https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fcf0a1d97765f37591f069e960cb36a4/ruzak.pdfIn PDF document text
- http://www.dogwoodagility.nl/ckfinder/userfiles/files/97396329124.pdfIn PDF document text
- http://koutingchina.com/upload/files/74614540196.pdfIn PDF document text
- http://surestegc.org/documentos/file/47117715347.pdfIn PDF document text
- https://lederstuhlshop.de/ckfinder/userfiles/files/22447326084.pdfIn PDF document text
- https://louvre.lv/res/wysiwyg/file/dunizixepav.pdfIn PDF document text
- https://coolinterier.sk/upload/files/86921363485.pdfIn PDF document text
- http://stroi-sistema.ru/img/30038271949.pdfIn PDF document text
- http://nocleginaplus.pl/uploads/userfiles/files/76407552472.pdfIn PDF document text
- http://www.ktgroup.co.uk/ckfinder/userfiles/files/81444606888.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2tnaohjaebfk2avk27mgig69df/23598749264.pdfIn PDF document text
- http://gelikonline.ru/content/Files/jolekavip.pdfIn PDF document text
- https://tsegypt.com/file/8321787177.pdfIn PDF document text
- http://dogable.de/userfiles/file/56891252674.pdfIn PDF document text
- http://rockefellersgold.hu/editor_up/73390944320.pdfIn PDF document text
- https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/guwelugujilowa.pdfIn PDF document text
- http://mp-hd.de/data/aktualnosci_imgs/file/61790886584.pdfIn PDF document text
- https://winpoasia.com/ckfinder/userfiles/files/21722976031.pdfIn PDF document text
- http://bhartiyambeohari.in/userfiles/file/gerebagerirefegav.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_off0000ebf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBF1	16900 bytes
SHA-256: `214bbb11aa3f2cf32be4ffc0265a7ca56310617ab75ec67de8da343a146f15c2`
`font_01_sfnt_off000117e6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117E6	11032 bytes
SHA-256: `78de383139b54decc1ee4415e77b9a672ddd67a82fd2660bf3fb5407086f777b`
`font_02_sfnt_off0001316d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1316D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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