PDF malware analysis — malicious · 666014e3a9f7b615

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 09:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: f7942f4f1208462680a829cf425c50cb SHA-1: e8ebc40ffd4f097c9aba770650fc8911ed0d25e1 SHA-256: 666014e3a9f7b6151180520fc28493f252b2f7b21cddad9eade7ff41ca8b8264

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm, suggesting a tactic to manipulate search engine results or distribute additional malicious files. The authoring application 'wkhtmltopdf' is noted, but no scripts were extracted to indicate direct execution or payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://krygina40.ru/UserFiles/File/42627733843.pdf In PDF document text
- https://cailux.lu/userfiles/files/1152180595.pdfIn PDF document text
- https://khmernative-rice.com/userfiles/file/25527499939.pdfIn PDF document text
- http://logenamerica.com/userfiles/file/pomuxemidad.pdfIn PDF document text
- https://ltes.tw-goods.com/UserFiles/files/durinibe.pdfIn PDF document text
- http://studiotecnicodavico.eu/userfiles/files/someroboxifigupunon.pdfIn PDF document text
- http://insightonafrica.in/userfiles/file/34203235056.pdfIn PDF document text
- http://b40555.handyfriendship.com/upload/files/xegojajafirakulu.pdfIn PDF document text
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/dbdad7ce39fa9e96e3211faac7df0472/68164878894.pdfIn PDF document text
- http://uelzecht.lu/userfiles/files/51610060894.pdfIn PDF document text
- http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/10954589317.pdfIn PDF document text
- http://maksimetall.ru/files/81392218328.pdfIn PDF document text
- https://namratalakhotia.com/userfiles/files/juzevavetexap.pdfIn PDF document text
- https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/059955b7e1c036f89c3fb30d1bf97055/3018615624.pdfIn PDF document text
- http://zatoodesign.com/userfiles/files/fedekisojanazaxe.pdfIn PDF document text
- http://sten.kr/club/data/userfiles/file/20210905044847.pdfIn PDF document text
- https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/dozekiraluno.pdfIn PDF document text
- http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/webopetipogisosuxidojo.pdfIn PDF document text
- http://artechq8.com/beta/uploads/files/3927835675.pdfIn PDF document text
- http://www.hausbaumesse.at/ckfinder/userfiles/files/wanumawidigekogamos.pdfIn PDF document text
- http://abwwilson.com/uploads/files/kezepow.pdfIn PDF document text
- https://xtrafitcoaching.com/www/images/files/federetemakabe.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tv+remote+premium+apkPDF 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_off0000c3cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3CF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000dbe1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBE1	16476 bytes
SHA-256: `20df761cf99ed3a8d83f289b0c1168aa70919749c3b3bb807b7929a67084f3a6`
`font_02_sfnt_off0001067d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1067D	10316 bytes
SHA-256: `0570d3bcf34afa8329031ff075126158c448df51893e59eefe718c76696a19d6`

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