PDF malware analysis — malicious · 6c7e6c0cc4d6c1a2

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 17:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 88df47c9af44c2a525e2c0b305204e96 SHA-1: 8c80582939ca761d4301236d4a9a25f3e63d2ee4 SHA-256: 6c7e6c0cc4d6c1a26cf58b9e7742dcb0e35bf7a7f0eced81c0cec3e0fa090ce1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external PDF files, indicating a link farm designed to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of unknown-reputation URLs strongly suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://cructi.ru/uplcv?utm_term=android+swipe+to+unlock PDF link annotation
- http://retailpark.bg/uploads/wysiwyg/files/mizomafolebevezi.pdfIn PDF document text
- http://ahkjt.com/upfile/file/24400999216.pdfIn PDF document text
- http://longarmquiltacademy.com/fckeditor/userfiles/file/piwovizidojebunal.pdfIn PDF document text
- http://directopinion.biz/uploads/FCK_files/file/72700590940.pdfIn PDF document text
- https://service-panev.com/userfiles/kusowiwam.pdfIn PDF document text
- http://phantasos.org/userfiles/file/kiximeriwizurasove.pdfIn PDF document text
- https://akproauto.com/nbloom/fckuploads/file/94861278763.pdfIn PDF document text
- http://thunderstar.cn/userfiles/file/20210911135508329052137.pdfIn PDF document text
- https://bliznacite.dvsportbg.com/files/bulixezaxuwuxi.pdfIn PDF document text
- http://webinaris.org/ckfinder/userfiles/publics/files/gimariroporovures.pdfIn PDF document text
- https://thuaphatlaihanoi.net/uploads/files/94323322150.pdfIn PDF document text
- http://lnshiyue.com/userfiles/file/20210910231517_844677129.pdfIn PDF document text
- http://tropo-design.com/ckfinder/userfiles/files/xesibixake.pdfIn PDF document text
- http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79554895642.pdfIn PDF document text
- http://watch62.ru/files/files/43264406113.pdfIn PDF document text
- http://elencostruzioni.it/userfiles/files/majavuwobivazufikosedimo.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d04d246f0---gupedelikazewexowi.pdfIn PDF document text
- https://pasarangroup1.com/contents/files/41813896799.pdfIn PDF document text
- http://haihengpharm.com/upload/files/46019920291.pdfIn PDF document text
- http://zavalinka.by/var/upload/file/46677516014.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2ecfb464750b5e4f2ab10330d284ad9b/93218192882.pdfIn PDF document text
- https://angkaganjil.com/contents/files/3698946008.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/57760321707.pdfIn PDF document text
- https://naves.cz/res/file/76402129459.pdfIn PDF document text
- 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_off0000cf0d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF0D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e724.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE724	10604 bytes
SHA-256: `e7ee69446e39589b21d6ee6c4b01970d4bc7b7e6a7c4c259a3b06f958e87bdc9`
`font_02_sfnt_off0000ff8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF8D	17060 bytes
SHA-256: `5502f1248c6ce838a54f1a90bddd487a2380aab425c0b8d80bdbf2cf2a060062`

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