PDF malware analysis — malicious · c281c398e601f597

MALICIOUS

PDF

77.1 KB Created: 2021-09-28 06:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: c3aef6afa8b5cde6c44a944f899d5683 SHA-1: 06d4648528fc0fe41bcef34f30f6c08453b5e330 SHA-256: c281c398e601f597f769e25f3f42487de964b007a4e21ba3f7bee562ed8794c4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's used to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating a tactic to obscure the true destination or spread malicious links across many domains.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=american+horror+story+hotel+streaming PDF link annotation
- https://huanghecables.com/d/files/74731460029.pdfIn PDF document text
- http://nbnjl.com/userfiles/files/fapepagorerufiko.pdfIn PDF document text
- https://megacook.pt/site/upload/file/78890912155.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/60750155909.pdfIn PDF document text
- http://special-pharma.com/upload/files/vipuw.pdfIn PDF document text
- http://ibconsulting.it/userfiles/files/22110086499.pdfIn PDF document text
- http://magogaralbamoble.com/galeria/files/zubumamabepobiwufetiz.pdfIn PDF document text
- http://bajajsports.com/userfiles/file/57851415783.pdfIn PDF document text
- http://zoldjogsi.hu/uploads/files/68524027751.pdfIn PDF document text
- https://dynasty888.com/image/files/20210919_020159.pdfIn PDF document text
- http://www.insight-assessment.com/ckfinder/userfiles/files/22920865331.pdfIn PDF document text
- http://mtegl.wsystem.sk/userfiles/files/natilinududawaduzesopi.pdfIn PDF document text
- https://vandolderskb.com/images/usr/julozefujenaxali.pdfIn PDF document text
- http://covina.crazyrockinsushi.com/uploads/files/lomobosuvozadipotevugokem.pdfIn PDF document text
- https://sunsoftinfoway.net/ckfinder/userfiles/files/tinekawejeburov.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1d38d4a7---tegajoveperibubeka.pdfIn PDF document text
- http://kovovyroba-nosniky.cz/UserFiles/File/jokaxutexokod.pdfIn PDF document text
- http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/fadufipezena.pdfIn PDF document text
- https://0955205219.jwa.tw/userfiles/files/nafejifunixikenonogegipad.pdfIn PDF document text
- https://ubk-sad.de/azubi/userfiles/files/pidifadugomapaju.pdfIn PDF document text
- https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/98336150009.pdfIn PDF document text
- http://enovosti.info/ckfinder/userfiles/files/98841135168.pdfIn PDF document text
- http://www.smwiarus.pl/ckfinder/userfiles/files/59401040346.pdfIn PDF document text
- https://almuhja.net/ckfinder/userfiles/files/6441866511.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_off0000c00f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC00F	10772 bytes
SHA-256: `abc31617ee28f1b98a52136a215974b3a12fcd8f33b3194a3d5bda3f7acce29e`
`font_01_sfnt_off0000d8b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8B9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f0cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0CB	20548 bytes
SHA-256: `9a82e5cf4d4fd13a697fda25a1aa1b3dbe9b979348f9cb70256e3a7a7309f51f`

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