PDF malware analysis — malicious · cc4a383d5b8ac8be

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 00:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 2af15c9ef40f3ee64939de0111f0c4dc SHA-1: 7d11cfe3820c2af17971b9c17869247566dc3515 SHA-256: cc4a383d5b8ac8be10f15587290dbfc56e994ab235e5d9aee0f9f8c3e3e46f63

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with several heuristics flagging it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9963

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
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://queure.ru/uplcv?utm_term=prince+of+persia+classic+free+download PDF link annotation
- https://lawrenceyezersky.com/userfiles/file/refejinovoleviv.pdfIn PDF document text
- https://aydin-elektrik.com/resimler/files/26953833497.pdfIn PDF document text
- http://bordahusfeldolgozo.hu/editor_up/13156476502.pdfIn PDF document text
- https://slide-bearing.com/d/files/92178636372.pdfIn PDF document text
- http://zhihepvb.com/upload/ckimg/files/202109092045136386.pdfIn PDF document text
- http://sdsenlex.com/upload/files/xavaponedu.pdfIn PDF document text
- http://stl-hk.net/userfiles/201903429.pdfIn PDF document text
- http://kirakuramenandsushi.com/uploads/files/72969359468.pdfIn PDF document text
- http://nzozkrowodrza.pl/uploads/editor/file/geforitisubititufakeva.pdfIn PDF document text
- http://litho-and-co.fr/ckeditor/upload/files/52201117242.pdfIn PDF document text
- http://gapp.fr/medias/files/fijosib.pdfIn PDF document text
- https://aquamedicasatumare.ro/ckfinder/userfiles/files/wepimefubetoku.pdfIn PDF document text
- http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qv0h8k4nbu9rnp2499kd91frb4/jedigujogu.pdfIn PDF document text
- https://www.luthier-auxerre.fr/ckfinder/userfiles/files/gevefaxudumef.pdfIn PDF document text
- http://fixafilm.se/userfiles/file/55126947655.pdfIn PDF document text
- http://vitalenzyme.com/uploads/fckupload/file/runajoxazozozudujexe.pdfIn PDF document text
- https://ambulatorioveterinariosismondi.eu/file/26225955579.pdfIn PDF document text
- https://omegaplus.bg/uploads/pages/files/govimamugaf.pdfIn PDF document text
- http://mnwebdesign.dk/userfiles/file/13038173672.pdfIn PDF document text
- http://nmways.com/uploads/fckupload/file/dalakove.pdfIn PDF document text
- https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a938f26a33---kujavupepaxezalilap.pdfIn PDF document text
- http://dominopark.pl/public/upload/ckfinder/userfiles/files/23765867019.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_off0000c9b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9B2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e1c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1C9	10604 bytes
SHA-256: `b130e5082018d4ce91f047e55269014266aa077acd841535b50b0cf4e1c1a951`
`font_02_sfnt_off0000fa20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA20	17756 bytes
SHA-256: `e15093884059736258c3cf85afe878e98532dd4c5da65c9262b8894444ac5a89`

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