PDF malware analysis — malicious · 0dbbf7c1f2aa3e8f

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 19:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d507863d0700404c872823d21c6f6856 SHA-1: e14554e3758ae20f80dbf2085a0b401b69148655 SHA-256: 0dbbf7c1f2aa3e8fcfe2d6c2f96054b5469718ddaf9b9ad59b4efdfbd92729f4

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 PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to a network of sites, likely for SEO poisoning or to serve further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://nezrenpin.com/calisma2/files/uploads/lakupuxetosijisekagovip.pdf In PDF document text
- http://xn--3bsx3iw22bmot.com/filespath/files/20210910233554.pdfIn PDF document text
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16145b13c92faf---gonodaj.pdfIn PDF document text
- http://tensoinox.com/userfiles/files/85581590922.pdfIn PDF document text
- http://saveursetsavoirs.fr/image/file/zopafagisurilipiminoxoje.pdfIn PDF document text
- http://precisao.net/files/files/99050691846.pdfIn PDF document text
- http://philipsphotographystudio.com/29286333060.pdfIn PDF document text
- https://carcable-bg.com/uploads/pictures/files/fuvuvosijozu.pdfIn PDF document text
- http://coinproject.com/userfiles/image/file/33407214730.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e464182c9---76397974162.pdfIn PDF document text
- http://disonde.com/filespath/files/20210902161214.pdfIn PDF document text
- http://steelbo.com/uploads/admins/u0/files/20210908233007.pdfIn PDF document text
- http://netinflux.net/userfiles/file/lonovugalo.pdfIn PDF document text
- https://semsaesp.com/ckfinder/userfiles/files/49952897268.pdfIn PDF document text
- http://psychologyforeverybody.com/ckfinder/userfiles/files/26972902101.pdfIn PDF document text
- http://thaide.org/userfiles/file/jabadusowezudisodu.pdfIn PDF document text
- http://poorclarescork.ie/images/82010057625.pdfIn PDF document text
- http://dxczx.com/ckfinder/userfiles/files/20210909_030917.pdfIn PDF document text
- https://visualmotion.nl/uploads/file/33219729830.pdfIn PDF document text
- https://yennenga.org/business_school/uploads/file/58826886983.pdfIn PDF document text
- https://gruntbudowa.pl/files/file/25937060127.pdfIn PDF document text
- http://whuntex.info/userfiles/file/98214497041.pdfIn PDF document text
- https://i-chat.tw/js/ckfinder/userfiles/files/wujodofux.pdfIn PDF document text
- http://osstemcardiotec.com/files/fckeditor/file/2175277861347718bb77c.pdfIn PDF document text
- http://risorsaterra.it/userfiles/files/6323803509.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sync+is+currently+experiencing+problemsPDF 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_off0000e55e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE55E	18684 bytes
SHA-256: `413e204611a1acfcf9c58ec041dbead9f2cf757b9fd14c6c79e75d133622a4c1`
`font_01_sfnt_off0001166e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1166E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E85	11084 bytes
SHA-256: `e2446451c3ace48419796ada65c6e2682822cb50641f229f12d0b4671ec0722a`

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