PDF malware analysis — malicious · 91a8db138bb9e031

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 08:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 3a0ad77c6326fcb6f1fc8e1ba9699a49 SHA-1: b9b822d529b2d678b216f65f100465fa69d2e4e8 SHA-256: 91a8db138bb9e0319865563815b34da79d6d9b35c5282947ab2daa094a14ef1f

124 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded links suggest it is designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.5623

Heuristics 4

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
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://oniceh.ru/uplcv?utm_term=space+decor+apk PDF link annotation
- https://sofahatinh.com/upload/files/83801461273.pdfIn PDF document text
- http://uelzecht.lu/userfiles/files/laliwomixuteroravovepuw.pdfIn PDF document text
- https://sandipkumardutta.com/ckfinder/userfiles/files/93301891865.pdfIn PDF document text
- http://baodieptailor.com/uploads/2021-09-12/images/files/23201532565.pdfIn PDF document text
- http://max-metal.pl/gfx/file/karotomamowapefaxag.pdfIn PDF document text
- http://resheto.ru/users_images/fck/file/57066057182.pdfIn PDF document text
- http://ciarajewellery.com/editor_upload/file/10511258875.pdfIn PDF document text
- https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/visuxatidowik.pdfIn PDF document text
- https://ajur.rest/uploads/userfiles/file/wobobewinasuxut.pdfIn PDF document text
- http://acril.ru/ufiles/files/48576388838.pdfIn PDF document text
- https://bahamianbrewery.com/ckfinder/userfiles/files/binakaxulepusazusuwagujoz.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210912203202.pdfIn PDF document text
- https://castilloexterior.net/ckfinder/userfiles/files/76218034192.pdfIn PDF document text
- http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/56829667822.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142e932d8b55---zeterimusiligaj.pdfIn PDF document text
- http://jncs.kr/page_data/file/20210910012527.pdfIn PDF document text
- http://houtackers.nl/userfiles/file/90141624741.pdfIn PDF document text
- https://cs-nippon-cp.com/mailmagazine/upload/files/pupojovo.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614366c9d9c0d---jolovifu.pdfIn PDF document text
- https://knurussian.kr/DATA/upload/files/202109131944345182.pdfIn PDF document text
- http://biometria.pl/photos_fck/file/36057950105.pdfIn PDF document text
- http://www.cottagegrad.ru/files/file/vamigajipewadofizugeju.pdfIn PDF document text
- http://hijoin.hu/editor_up/57612783817.pdfIn PDF document text
- http://autolavaggiocraparotta.it/userfiles/files/80226870823.pdfIn PDF document text
- https://tes-sys.com/uploads/ckfinder/files/20210917/16318350857581.pdfIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d773.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD773	10164 bytes
SHA-256: `8b75b0ae2a51e1acd8bee5e73f80c2b70e50181f84491fa2de13d97bcf8ad57a`
`font_01_sfnt_off0000ee4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE4D	17276 bytes
SHA-256: `9041019fff881a755ec57e0b572c33fa609ddc6c9a22586c2b55bedfe989cc15`

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