PDF malware analysis — malicious · c7ac79acb27a8df8

MALICIOUS

PDF

80.6 KB Created: 2021-03-23 12:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 94ed643b959f04ce4d7a4ad584a3b5c7 SHA-1: d02e66e5edde3c384cd6909cba36dc998d1309ae SHA-256: c7ac79acb27a8df8c107c3473ea45e9bddf969787343ddd9bef8393e2f6d088c

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with at least one pointing to a potentially malicious domain (vilenefex.ru). This pattern suggests the document is designed to lure users to external sites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique. No scripts were extracted from this sample.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/wix?keyword=libro+el+manuscrito+encontrado+en+accra+pdf+gratis PDF link annotation
- https://visofamawuri.weebly.com/uploads/1/3/2/3/132303269/rikumizuziwegof.pdfIn PDF document text
- https://lumixiwutetus.weebly.com/uploads/1/3/4/3/134388296/4033448.pdfIn PDF document text
- https://xemojunaxumig.weebly.com/uploads/1/3/4/2/134265853/44218.pdfIn PDF document text
- http://wovolutoxali.iblogger.org/vaxajej.pdfIn PDF document text
- https://murufafutebe.weebly.com/uploads/1/3/4/4/134473477/vufaxe.pdfIn PDF document text
- https://xoxilorimisutoz.weebly.com/uploads/1/3/4/7/134705863/3733805.pdfIn PDF document text
- https://javexediwoxi.weebly.com/uploads/1/3/4/5/134584379/liwuxesub.pdfIn PDF document text
- https://bivovipolever.weebly.com/uploads/1/3/4/3/134347360/b075b3fbf7d513f.pdfIn PDF document text
- https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/naxujatasibaguv_pobabini_fajuv.pdfIn PDF document text
- https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/9690926.pdfIn PDF document text
- http://bugesawuterodam.iblogger.org/pagakixor.pdfIn PDF document text
- https://voresefum.weebly.com/uploads/1/3/0/8/130813922/338890a7507990.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://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_44f49c41740c48cf9f79931d6bdb4abc.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/0b856da6-9066-4bd6-8099-8b25a8f041ea/stc_1000_manual.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/702ae875-0cf4-4de4-9f19-6b74a654e62b/5559668967.pdfIn PDF document text
- http://depuniwawugupi.epizy.com/zufumavugesuzozeximenin.pdfIn PDF document text
- http://pagupim.epizy.com/inhibidores_de_aldosa_reductasa.pdfIn PDF document text
- https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_927231ffd1c04d85aad700489b79b4d4.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/d2383de9-20f6-42a7-a6e9-e3e14007cf39/in_the_dust_of_this_planet_quotes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e4f41965-b63b-4d06-b7fb-203e2f83b0c0/fawinekofugabese.pdfIn PDF document text
- http://tozuduno.epizy.com/is_beer_not_good_for_acid_reflux.pdfIn PDF document text
- https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_ee98310c110240c693071dbbf98710fd.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_off0000ecf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECF2	5440 bytes
SHA-256: `d9dcf4339b34bcbbdf3631cfb253eea3047fc7e656fa2e2d9783459b3b3c5ef2`
`font_01_sfnt_off0000ff4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF4A	12020 bytes
SHA-256: `d4dbc51fd396378a02130ab51103ebf83dd455ac71f5bd76f5ebfdfcf79dcb08`
`font_02_sfnt_off0001267f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1267F	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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