PDF malware analysis — malicious · 6afdd07054d49254

MALICIOUS

PDF

101.9 KB Created: 2021-09-20 12:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 73c3fb18dfb6369714944be87e6f7479 SHA-1: 25b9ef6b8618efd7eb11e66d535b5dcb7d26a79c SHA-256: 6afdd07054d49254f169c3b2c9d27e7cee49b8c6830211bd5123c397cb5d9e80

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, some of which are associated with file downloads. The 'Password-protected archive handoff' heuristic strongly suggests the document's purpose is to trick users into believing they need a password to open an archive, a common social engineering tactic to bypass security controls and deliver malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://ketchas.ru/uplcv?utm_term=how+get+free+v+bucks+in+fortnite PDF link annotation
- https://piauiaqui.com/ckfinder/files/mumuvowakarax.pdfIn PDF document text
- https://getracemirates.com/userfiles/files/luvomimudivurakuxa.pdfIn PDF document text
- http://abwmercury.com/uploads/files/82312210953.pdfIn PDF document text
- https://bc2000.order-pro.com/ckfinder/userfiles/files/64357765992.pdfIn PDF document text
- http://77owship.netsociality.com/upload/files/pepulobilusuk.pdfIn PDF document text
- http://hoangminhceramics.com/app/webroot/uploads/files/87779827038.pdfIn PDF document text
- https://fluffy-chins.com/images/file/votikalele.pdfIn PDF document text
- http://torby.kbo.pl/ckfinder/userfiles/files/21986023626.pdfIn PDF document text
- http://bratislava.topenglish.sk/app/webroot/gallery/files/34582630830.pdfIn PDF document text
- http://bkm-market.net/userfiles/file/71905227590.pdfIn PDF document text
- http://teleinwestor.com/userfiles/file/zesitefonetoliwironufi.pdfIn PDF document text
- http://tiszaikaland.hu/upload/file/pokuz.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadd57d4c3---dofugik.pdfIn PDF document text
- http://autowassenindex.nl/images/uploads/94676732898.pdfIn PDF document text
- https://przyklejki.pl/userfiles/refibi.pdfIn PDF document text
- https://rosenstein.lu/userfiles/files/85736940866.pdfIn PDF document text
- https://subded.org/userfiles/file/79829527290.pdfIn PDF document text
- http://lukasikgroup.pl/Image/files/vufigugixibatiba.pdfIn PDF document text
- http://vanhacollection.com/images/files/96728215525.pdfIn PDF document text
- http://swapnakoodu.com/fck_uploads/file/52747785106.pdfIn PDF document text
- http://studiofagiani.eu/userfiles/files/53129731457.pdfIn PDF document text
- http://yuh-tarng.com/userfiles/file/gefoxabaguvuxebulomizupu.pdfIn PDF document text
- https://full-e.com/app/webroot/userfiles/files/20210918_221810.pdfIn PDF document text
- http://rtm-plus.com/ckfinder/userfiles/files/salifevamasebujanupiv.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_off00011c60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C60	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013477.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13477	10780 bytes
SHA-256: `7081de4c41df36056685dad68e540f2cf1e0062de07b69ca2491af486044b0c3`
`font_02_sfnt_off00014d7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14D7B	22584 bytes
SHA-256: `7064a666251c011c86404b1c8a28077627a7abdd0840f9ccab5d40018589c447`

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