PDF malware analysis — malicious · c159e752e9e80bf7

MALICIOUS

PDF

90.6 KB Created: 2021-09-16 23:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 21196d80f59b967608ffce82dec38d7a SHA-1: 6bdb2ce0c3af65a3de43764f47592120c1024676 SHA-256: c159e752e9e80bf739d53bc1d055aabfd1bbf689ad1b65b18132e35f8f3ea798

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic indicate a strong intent to direct users to external, potentially harmful, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

Heuristics 5

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.
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://infrive.ru/uplcv?utm_term=fortnite+android+download+all+devices PDF link annotation
- https://ceiling.holcom.vn/webroot/img/files/85748298029.pdfIn PDF document text
- https://marblobaths.ph/app/webroot/img/files/kudipoxetubaz.pdfIn PDF document text
- https://skywaytravelandholidays.com/ckfinder/userfiles/files/kowixemosuxupegemogojud.pdfIn PDF document text
- http://thaihotelsale.com/FileData/ckfinder/files/20210906_E12575B54678A1C0.pdfIn PDF document text
- http://staceyasp.com/UserFiles/file/49671421862.pdfIn PDF document text
- http://futboltotal.net/images/files/73083004853.pdfIn PDF document text
- http://baikalspring.ru/ckfinder/userfiles/files/rebararusutowiwidabufabo.pdfIn PDF document text
- https://izometal.net/mm/file/10255789375.pdfIn PDF document text
- http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133356bad84b---38287321147.pdfIn PDF document text
- http://kolaykanal.com/userfiles/files/46908697736.pdfIn PDF document text
- https://idosekotthonaveresegyhaz.hu/files/files/zewepixajeso.pdfIn PDF document text
- https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d700d22d8f---votixuwixub.pdfIn PDF document text
- http://rungruangsteel.com/public/upload/userfiles/files/33177324640.pdfIn PDF document text
- http://salonmysliwskirys.pl/userfiles/file/timojinupewezivusogevula.pdfIn PDF document text
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5904f7dc---sejeroj.pdfIn PDF document text
- http://zulassung4you.de/bilder/file/17212896809.pdfIn PDF document text
- https://mobiligennari.com/userfiles/file/69959401090.pdfIn PDF document text
- https://chimrodistribution.ro/poze_diverse/file/luxal.pdfIn PDF document text
- https://nordavril.com/userfiles/file/zewotorojodikozefijesosig.pdfIn PDF document text
- http://bakineshr.az/ckfinder/userfiles/files/75713183782.pdfIn PDF document text
- http://twtqedu.com/userData/ebizro_board/file/majiwuvipedipeminip.pdfIn PDF document text
- http://michardardillier.com/ckfinder/userfiles/files/wedopesomol.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d727.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD727	10492 bytes
SHA-256: `ba8ea7e7adb1e4663fcd00e975f81e29b2a21f2108506a9bde84aa13f5a9fa38`
`font_01_sfnt_off0000ef24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF24	16788 bytes
SHA-256: `6759a966ff9cdf9987e29738e509f2c05a02dc7f73b2a3fd7dbe43cffc4233c8`
`font_02_sfnt_off00010759.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10759	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00011f6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F6B	24484 bytes
SHA-256: `5d4a1fcbd850abb11af1a6a2ce09ebe8c7a47ead2ee7db37befe6f2ce9c57fd1`

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