PDF malware analysis — malicious · c26929fadbbaa939

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 09:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: cdc2903536769d1716fe17b41283e33b SHA-1: 496f161858217771a5fa0190ee61b7762011a357 SHA-256: c26929fadbbaa939d2b8217f527c3256118346ee00ae13e5869a7c8c79226255

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to download and execute a second-stage payload or redirect the user to a phishing site. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using numerous disposable domains for hosting malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=ragnarok+poring+merge+mod+apk PDF link annotation
- https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140400801d23---ragivalolowovizalo.pdfIn PDF document text
- http://mertcelikkapi.com/userfiles/file/varurujezowovarunokesapix.pdfIn PDF document text
- http://craft-personal.de/userfiles/file/17639392957.pdfIn PDF document text
- http://pnmanagementsolutions.in/uploads/54006723077.pdfIn PDF document text
- http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/fisalanuluzakuzekig.pdfIn PDF document text
- http://xn--80akoseq9f.xn--p1ai/userfiles/file/jitufexinijirefipe.pdfIn PDF document text
- https://aletihad-group.com/userfiles/files/wikanetobadi.pdfIn PDF document text
- http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/purufataburegugupelikok.pdfIn PDF document text
- https://nikosdimos.gr/userfiles/file/17362047260.pdfIn PDF document text
- https://linker.tw/files/10782529415.pdfIn PDF document text
- http://atya.eu/files/file/65789323274.pdfIn PDF document text
- http://taketty.xyz/js/ckfinder/userfiles/files/245875305.pdfIn PDF document text
- http://manisafar.com/basefile/marcosafarir/files/kebosabakefezoxebemiju.pdfIn PDF document text
- http://www.juniorcollege.cl/ckfinder/userfiles/files/ragowodexidakexuxesali.pdfIn PDF document text
- http://tuivaivietnam.com/uploads/files/7831962049.pdfIn PDF document text
- https://2acontractor.it/images/file/84212379281.pdfIn PDF document text
- http://harckocsik.hu/userfiles/file/8719924275.pdfIn PDF document text
- https://yp05.com/_UploadFile/Images/file/62832571747.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/12432939739.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/29bf994a6e313f989fcdd6547ed63d1d/47089162975.pdfIn PDF document text
- https://atrax.eu/userfiles/file/60747413178.pdfIn PDF document text
- http://tachikawa-derma.biz/ckfinder/userfiles/files/82802309890.pdfIn PDF document text
- https://thefertilizerequipment.com/d/files/buzibovelabinujeganikugi.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_off0000d7d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7D7	20012 bytes
SHA-256: `c2554447523fed7ccc1aac8a92edda15b430f8e018ac472a85bcfbaa4d58c904`
`font_01_sfnt_off00010bdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BDC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000123f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123F3	10560 bytes
SHA-256: `525d916b86dc5527a6fe4b1ba2167f1b8d461eaa07121d260fed930f2360eace`

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