PDF malware analysis — malicious · 7c8382687daf080f

MALICIOUS

PDF

86.2 KB Created: 2021-04-05 03:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 9f5587bfee41d41d058c944de3ec1e96 SHA-1: 25a2314cce088124f6940898ea7ad8d15289a52b SHA-256: 7c8382687daf080fa5398dd67fc4423a42ae8924fdf7c872ce48fed4804c2355

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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 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.
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=civilization+5+warmonger+guide PDF link annotation
- http://souve.me/dollar_tree_application_indeedh4kod.pdfIn PDF document text
- http://ligugiban.scienceontheweb.net/24_hour_clock_worksheet.pdfIn PDF document text
- http://furniture21.online/lifufuxomipapimemonaz7il.pdfIn PDF document text
- http://effektzhizni.ru/blender_2.8_manual_espaoln9s4c.pdfIn PDF document text
- http://alcexpress1.xyz/76269661908v5zc0.pdfIn PDF document text
- http://sidufapas.mywebcommunity.org/natosaridoweduta.pdfIn PDF document text
- http://levojefozaloro.mywebcommunity.org/torobigevugexem.pdfIn PDF document text
- http://marinarus.space/jartex_network_reportjfqgy.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_2486054f271a4d12867026a22a6f0778.pdf?index=trueIn PDF document text
- https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_82bb1b2365d445d2bc43e6fdcf4b74a4.pdf?index=trueIn PDF document text
- https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_db79a0930d764af0a6bb06d52acf2405.pdf?index=trueIn PDF document text
- https://5a4e7950-e122-4b3c-9cf7-894e7f5b1216.filesusr.com/ugd/76aeb6_a9918c05587643fa9aa3b3c732f66683.pdf?index=trueIn PDF document text
- https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_0ccfe65259064977b96bd8e88b041344.pdf?index=trueIn PDF document text
- https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_8ef57b5247ed41a39e9da016b42d8944.pdf?index=trueIn PDF document text
- https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_1ea58b4385f74e0eaa4bed7982b39471.pdf?index=trueIn PDF document text
- https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_efb3319f108949d298961023b27daabf.pdf?index=trueIn PDF document text
- https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_2b315a5e72024f9f8593c84416e48c31.pdf?index=trueIn 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_off00010011.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10011	5196 bytes
SHA-256: `6f55d1018f7105ad326e9492286cd01bb3fc7946981b57c573dfefe07b6d6c48`
`font_01_sfnt_off000111c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111C2	13120 bytes
SHA-256: `07729265ff565729fa5432dab2d30f6c4b946a05978d3acda7d7563771537914`
`font_02_sfnt_off00013c38.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13C38	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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