PDF malware analysis — malicious · c13b676979aea48c

MALICIOUS

PDF

79.4 KB Created: 2021-03-31 10:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 29801499046fa22e4361745d3c2de87e SHA-1: 68e9032c50e00d13c16cfa7aeb78f141a39f23d8 SHA-256: c13b676979aea48cc012a852cd07d3282d275b0bde61dd6b29e8fef05eccc07d

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 functions as a link farm, containing numerous external URLs that point to other PDF documents. The presence of these links, particularly on disposable hosting and with UTM parameters, suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or SEO spam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=area+and+perimeter+of+sectors+worksheet+pdf PDF link annotation
- https://duxapekekabi.weebly.com/uploads/1/3/1/3/131381277/3388551.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4468843/normal_5ff13ff710082.pdfIn PDF document text
- https://sujanumijixedi.weebly.com/uploads/1/3/4/5/134501714/995437895a8bd5.pdfIn PDF document text
- http://patajafurep.mywebcommunity.org/momagi.pdfIn PDF document text
- https://vujaroroxino.weebly.com/uploads/1/3/5/3/135314625/8016441.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4472213/normal_6059b41161a37.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4374536/normal_5ff27c9399ba4.pdfIn PDF document text
- http://wotasabe.22web.org/23823335357.pdfIn PDF document text
- https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/5244.pdfIn PDF document text
- https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/jidukarexika.pdfIn PDF document text
- http://zoluwofemofuper.sportsontheweb.net/nuwobofipisefujomexo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4404980/normal_60522b18efacc.pdfIn PDF document text
- https://xowedoditigivi.weebly.com/uploads/1/3/4/7/134714126/jefowifa-mezamumelazuw-dovos-nujabolel.pdfIn PDF document text
- http://xelapelumu.iblogger.org/bikipawoveb.pdfIn PDF document text
- https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/8441698.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493245/normal_5fd92ea5299ce.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367922/normal_6041b0079d64f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426090/normal_60293b548bf21.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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
- 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_off0000e0f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0F7	5508 bytes
SHA-256: `618c7031202bcacd89100a725ebcf28983941ff4d0b5162cce1bb52fb67b35ff`
`font_01_sfnt_off0000f3a3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3A3	11604 bytes
SHA-256: `b34b209777e99aa5b872dad1e19f0e1c0a40eadea7ecee78df93be156dec9f50`
`font_02_sfnt_off00011b71.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B71	16060 bytes
SHA-256: `ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833`

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