PDF malware analysis — malicious · 083bd1be2472f3b9

MALICIOUS

PDF

86.4 KB Created: 2021-09-22 09:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 00c23d134e6fa5fb9ae5935936c9dd05 SHA-1: f1f0bdf20bad295f323eccfabd97a5eb99c28663 SHA-256: 083bd1be2472f3b9336ab9c6bc2e90ad1803014fb2a4aa8fcfe49caa4aecc49d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a high number of external URIs pointing to link farms. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware hosting sites. The numerous unknown URLs indicate a broad distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://tavcam.com/upload/ckfinder/files/18229067362.pdf In PDF document text
- http://lab4050.com/upload/editor/file/709111848.pdfIn PDF document text
- https://safrano.pl/userfiles/file/witusuvifuwil.pdfIn PDF document text
- http://teplorium.su/userfiles/file/fipugawoxupuza.pdfIn PDF document text
- https://horkolas-gatlas.hu/ufiles/file/66747671840.pdfIn PDF document text
- https://alzubidi.com/userfiles/files/pepefusixofilami.pdfIn PDF document text
- https://academiesutherland.com/userfiles/file/1499793455.pdfIn PDF document text
- http://labotinnghia.com/img/files/pesoxititorif.pdfIn PDF document text
- http://ridendo.cz/files/file/lezufedemuguzoxirejejare.pdfIn PDF document text
- http://z-i-f.ru/userfiles/file/dapokasibanovugufopog.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/9550771007.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/05c42e2277d5c1a8892d4ecd13bf7c89/16608375096.pdfIn PDF document text
- http://33podarka.ru/pictures/files/33907755744.pdfIn PDF document text
- http://mvpbuilding.com/userfiles/file/tirezevijarofomepedeka.pdfIn PDF document text
- http://findmecakes.com/userfiles/files/vubakaladufupex.pdfIn PDF document text
- https://karolinanowak.com/userfiles/file/43610361519.pdfIn PDF document text
- https://woodfur.in/userfiles/file/zubaxuvun.pdfIn PDF document text
- http://joyandwowbook.com/upload/file/35892047196.pdfIn PDF document text
- http://sallytour.com/FileData/ckfinder/files/20210906_D7C05279910D3EF4.pdfIn PDF document text
- http://cardealer-space.com/js/upload/files/65558499919.pdfIn PDF document text
- https://holcom-wd.holcom.vn/webroot/img/files/kunumiwuvijalufaziv.pdfIn PDF document text
- https://amt-alarmy.pl/userfiles/file/79560708520.pdfIn PDF document text
- http://toeicspeaking.net/_UploadFile/Images/file/tefetepolevapefibo.pdfIn PDF document text
- https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/df088f7029b169dec822a68e7275c5f4/wuvopow.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=business+model+generation+pdf+downloadPDF 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_off0000eb2e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB2E	17976 bytes
SHA-256: `6a28a9f8df681ab2179d34fbfa8499a86ed3421c11f8046863b4cb0d8cd6c576`
`font_01_sfnt_off00011a43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11A43	11080 bytes
SHA-256: `1e28a8e1713b8790e90233bf2929edcce6169e1ac9156ee2bffd2fc6a5e21917`
`font_02_sfnt_off000133f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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