PDF malware analysis — malicious · 5629dc1676c266b8

MALICIOUS

PDF

89.3 KB Created: 2021-09-19 11:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: ddee7f19e15be5493858319583eb6887 SHA-1: b5945770fd05ed3cb1f412de864af406fdc07cf9 SHA-256: 5629dc1676c266b8697d4c7029da488b5cc120e8d0eaf77f8dcac57f0fdcf97e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically calls out this behavior.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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 http://visusmarble.com/images_upload/files/72972025188.pdf In PDF document text
- https://vgi-vn.vn/app/webroot/img/files/mosodefuwurixixipajidol.pdfIn PDF document text
- https://chief-moving.com/editor_upload/file/fumefupure.pdfIn PDF document text
- http://gdgom.com/upload/file/210912200024333370ztdvfdnttenn.pdfIn PDF document text
- http://niezapominajkowo.eu/userfiles/file/biduvabewivuromopakevusit.pdfIn PDF document text
- http://bytip.net/filespath/files/20210902142230.pdfIn PDF document text
- https://wendi101.com/userfiles/file/51045144921.pdfIn PDF document text
- https://webvitamin.vn/app/webroot/uploads/files/sotolobilet.pdfIn PDF document text
- http://nickelsgrafikdesign.de/ckfinder/userfiles/files/jewejasokejadevowejijavi.pdfIn PDF document text
- https://sts-cct.com/app/webroot/userfiles/files/87733694950.pdfIn PDF document text
- https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e0c0e1ec6---sozurutifarubevalodev.pdfIn PDF document text
- http://medicamarsala.it/userfiles/files/94729833511.pdfIn PDF document text
- https://galerieportelouise.be/userfiles/files/37336788929.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf367fcdf---zukili.pdfIn PDF document text
- http://www.euro-fly.eu/userfiles/files/54864601777.pdfIn PDF document text
- http://zdrowejaja.com/Upload/file/42592669273.pdfIn PDF document text
- http://prplus4u.com/ckupload/files/87154848340.pdfIn PDF document text
- http://arcstema.com/userfiles/files/fupobupixumetemasenabu.pdfIn PDF document text
- http://osayit.com/images/file/xubakilusegamivom.pdfIn PDF document text
- https://reaga.net/js/ckfinder/userfiles/files/nakibaguvidab.pdfIn PDF document text
- http://topspeed4wd.com/ckfinder/userfiles/files/57259170260.pdfIn PDF document text
- http://www.rajpuc.pl/pics/file/26065656656.pdfIn PDF document text
- http://ageofwonders.buka.ru/sadm_files/nibezinivejojunob.pdfIn PDF document text
- http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53610891846.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=action+tamil+movie+watch+onlinePDF link annotation
- 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_off0000fab8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAB8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000112ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112CA	17596 bytes
SHA-256: `dee76fa39c4c3cbc00c09d44385345878b2fb332bca6bf4b0be563815ae90ce9`
`font_02_sfnt_off00014000.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14000	10360 bytes
SHA-256: `f41d647024ceb79a5b42492afdb9580bbb79366d1167262127c7308abe51471e`

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