PDF malware analysis — malicious · 7b6ea0ea38b1bb9d

MALICIOUS

PDF

94.2 KB Created: 2021-02-17 06:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 6d9382abf55f58d1f866dac74c0f3847 SHA-1: 083d0e4140b7d4a1276f9dfdd394bc56393efaae SHA-256: 7b6ea0ea38b1bb9d13dd17bce598d4f585b12d0b284cbde14190bb2b5f070400

226 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document functions as a link farm, containing numerous external URLs pointing to other PDF files, likely as a tactic to improve search engine ranking or distribute malicious content. The presence of a password-protected archive lure suggests an attempt to bypass security scanning by encrypting the actual payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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://seumenha.ru/123?utm_term=what%2527s+another+synonym+for+employment PDF link annotation
- http://segwaywheelchair.ru/movies_converter_to_mp4_freexupwy.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4481170/normal_5ff71a4c30a45.pdfIn PDF document text
- https://dijujuvosidig.weebly.com/uploads/1/3/0/8/130873718/jalowizaragekef.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368222/normal_5fcb0201a5ae7.pdfIn PDF document text
- https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/5328199.pdfIn PDF document text
- http://bio-ita.fun/99255508383m3xqi.pdfIn PDF document text
- https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/5391946.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404745/normal_5fd7dbcdea2d7.pdfIn PDF document text
- https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/864b6ace1fcc.pdfIn PDF document text
- https://fumewalifo.weebly.com/uploads/1/3/4/8/134884483/jotijosonawo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495262/normal_5fdf10908d293.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4455639/normal_6011193db96f9.pdfIn PDF document text
- https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/9577933.pdfIn PDF document text
- https://pakefipeve.weebly.com/uploads/1/3/4/0/134017053/643f54a3706.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4384471/normal_5fc9cbbc021bf.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://gevitejivojo.rf.gd/likasakowuvegulu.pdfIn PDF document text
- http://zuwarikufaz.epizy.com/akai_professional_mpk_mini_manual.pdfIn PDF document text
- http://xokesuluz.epizy.com/viwimovisov.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF8E	22372 bytes
SHA-256: `371750982721229d966a2aa70d083efa992d4b41ee4f6363ef22da9905e07601`
`font_01_sfnt_off000130d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x130D4	5292 bytes
SHA-256: `f79af57e65d0b90b9dd3b419ae6394e5f2ce78ead745fff160dcf710514cf2e6`
`font_02_sfnt_off000142c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x142C6	11952 bytes
SHA-256: `1599250a44d7e501d9ebbb95c22bee672eb613f4dee58e3560f814473283e434`

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