PDF malware analysis — malicious · dbb9d4a5d60a330e

MALICIOUS

PDF

84.2 KB Created: 2021-05-23 23:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 7a04c52b28cfb40549c5a1b6841b3143 SHA-1: 877ab11d3f0d96655074eeafa7acf389e151af1a SHA-256: dbb9d4a5d60a330e50aade0b357228a18536e8b1d91723f181f97c8665ef73d2

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to reference a tutorial, which is a common lure for users to click on malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://dafemum.ru/strik?utm_term=blender+character+modeling+tutorial+2.8 PDF link annotation
- https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/6ff994a5.pdfIn PDF document text
- https://kinigapiluxuke.weebly.com/uploads/1/3/4/8/134863840/zewoxupuso_kusanufe_nanusoda_nokode.pdfIn PDF document text
- https://kegovivaxik.weebly.com/uploads/1/3/4/5/134506491/fenekironi.pdfIn PDF document text
- https://nitagupivef.weebly.com/uploads/1/3/4/3/134342099/3065186.pdfIn PDF document text
- https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/fekefasewogawomeduw.pdfIn PDF document text
- https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/c2394.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4424647/normal_6027dfd42f317.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4448976/normal_6037d89870f43.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404959/normal_6029d15298f1b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447497/normal_603029b9c4e6f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422163/normal_60593dafccbd9.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4402297/normal_6006b8782888d.pdfIn PDF document text
- https://wumemoxononaw.weebly.com/uploads/1/3/4/2/134235532/3362391.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4502920/normal_606245f1207da.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4491686/normal_6008ce7103934.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379959/normal_604681c3d5ba2.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4498883/normal_5ff8ce55d4daf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484633/normal_604347276e7ff.pdfIn PDF document text
- https://nexakolaligu.weebly.com/uploads/1/3/1/8/131871479/8765852.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://uploads.strikinglycdn.com/files/37b9f91a-7a56-4bb9-9a41-a487ca504642/37910452780.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/44c2621a-8dc5-4fb3-898e-89f68fbfe841/xowezawabo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f3a305fd-e2e4-448a-b8f1-a425534cdb02/ludegasuxinomanegapuz.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fda34eec-c680-47a1-911d-606a03eb377a/epictetus_enchiridion_greek.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4038ad0f-39e8-46bc-84fe-8745fb07a7df/pogusegabefimexuvixef.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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000eb61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB61	2900 bytes
SHA-256: `884cbfdeb878ee20e2c146b05a1641383b41b88cd86c369d761b3a8bde37f1a2`
`font_01_sfnt_off0000f5b8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5B8	5464 bytes
SHA-256: `51ef0bd6200809388c220615eeef830d804b8a91a368be839bdc36e59d293158`
`font_02_sfnt_off0001080b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1080B	1800 bytes
SHA-256: `e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d`
`font_03_sfnt_off00011099.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11099	10396 bytes
SHA-256: `80ae574b124d07c4a3bb5257ba03e44f1de8549906078258d02d93f861076ebf`
`font_04_sfnt_off00013405.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13405	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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