PDF malware analysis — malicious · e40aa3b11534c8c3

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 23:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 2b887b63cf17205a848cf7557f667cc9 SHA-1: afd635f8d1bd34ee64c29a931bde87235cdfa9dd SHA-256: e40aa3b11534c8c3d747034635d6160c1692d42676dc3e643e3eb6dc4c9b968e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. The presence of numerous embedded URLs, many pointing to potentially disposable hosting and link farms, suggests an attempt to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights this behavior, indicating a high likelihood of a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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 http://rileyillustration.com/images/agency/files/tuwid.pdf In PDF document text
- http://arunimaflavours.com/userfiles/file/jijaniredobuxalugufivi.pdfIn PDF document text
- https://searchlink.org/userfiles/file/35666820077.pdfIn PDF document text
- https://vanrun-it.nl/userfiles/files/sodesumifetosat.pdfIn PDF document text
- http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393c6b9a6c5---46622003150.pdfIn PDF document text
- http://fst-uinsu.net/userfiles/files/zafusupupi.pdfIn PDF document text
- http://dedanskecasinoer.dk/userfiles/file/90557455061.pdfIn PDF document text
- http://macro-e.com/app/webroot/userfiles/files/31657402517.pdfIn PDF document text
- http://rc-saty.cz/gais/image/file/wavijuxanatukilubezo.pdfIn PDF document text
- https://nasco-ye.com/uploads/file/8752545589.pdfIn PDF document text
- https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f21b0ed9fe19fcfe399cbf17b2cab7ad/60398549606.pdfIn PDF document text
- http://happysmilecard.com/uploads/files/24202418523.pdfIn PDF document text
- http://genbreedpublisher.com/files/upfiles/file/sivobivorirukojepalaj.pdfIn PDF document text
- https://zilalcooling.com/other_files/File/1840328002.pdfIn PDF document text
- https://daynexweb.com/upload/ckfinder/files/varosiroka.pdfIn PDF document text
- https://yam-token.com/business_school/uploads/file/pejeremopewozatavedamo.pdfIn PDF document text
- https://sjamsul-hidajat.id/ck_uploads/uploads/files/5715810055.pdfIn PDF document text
- http://scouttautomotive.com/editor_uploads/system/files/lesuvebob.pdfIn PDF document text
- http://circuitvietnamcambodge.com/hinhanh/file/63892571056.pdfIn PDF document text
- http://www.morrisjones.co.uk/EditorImages/file/44455368132.pdfIn PDF document text
- http://evohome.pl/userfiles/file/zexamesesodatoxikigek.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+punch+club+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c3d1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3D1	10440 bytes
SHA-256: `c3a8d9ff21831f326e897f5451be50b49b26cafd1bbd1f6d115786caa0e44d43`
`font_01_sfnt_off0000db26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB26	16728 bytes
SHA-256: `ccb51e9d2e0f2109628315025a03157c7c463c967863686e17a4ff3925aef098`
`font_02_sfnt_off0000f2ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2EC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00010afe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AFE	22028 bytes
SHA-256: `2ce936c593f6d5bdfe78338b1e1f1a97d8fdb541de12c4414a49fc454b18ea4d`

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