PDF malware analysis — malicious · b6d0b88fface2ad7

MALICIOUS

PDF

74.3 KB Created: 2021-03-09 00:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 5a88a3a05100f6c7e225e9cdad817638 SHA-1: 0824d10bd0558ddfab6d793b00f65b095e74b2f5 SHA-256: b6d0b88fface2ad746a1bfee1fe1836f86e8792fe9b35e10947b8f24080d632e

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external PDF links, many pointing to SEO-optimized redirectors. The primary IOC is the redirector URL https://jacksth.ru/123?utm_term=formel+anlagendeckungsgrad+3, which likely serves as a lure for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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/123?utm_term=formel+anlagendeckungsgrad+3 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4470537/normal_60243b9da20ae.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425005/normal_6027b1fdbc99a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476421/normal_5fd72fdf0f00e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4423189/normal_5fd8d947873ba.pdfIn PDF document text
- https://sokepubin.weebly.com/uploads/1/3/5/3/135391759/buzatoporibugonawone.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452398/normal_6041cf16a24c6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465270/normal_603fb7ce77183.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369304/normal_60216afae6d9d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367947/normal_6011a070d5158.pdfIn PDF document text
- https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/532c50fa11.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475580/normal_602b7d645c6a4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4402964/normal_601fd603c7640.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386076/normal_601fd879c4d39.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403959/normal_5fd8245383008.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450418/normal_6027f1fab6a9a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4467577/normal_5fdeead9c6d8c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427526/normal_60393b7ed9781.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418963/normal_6044982e2969b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4494883/normal_5fc6c4fe4a88b.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/tolivajupeku/15954553666.pdfIn PDF document text
- https://s3.amazonaws.com/wekibik/jekarawaw.pdfIn PDF document text
- https://s3.amazonaws.com/xafaxotaful/fixopalobadavamotopivafe.pdfIn PDF document text
- https://s3.amazonaws.com/xomepixo/76737720666.pdfIn PDF document text
- https://s3.amazonaws.com/gumegulaxi/41509005270.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e287.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE287	5444 bytes
SHA-256: `bc6fd41cc525b734365eb9ca5afdb85b657901b7aa90782fd448440c62bd5ea2`
`font_01_sfnt_off0000f4fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4FC	11248 bytes
SHA-256: `e690e0d8215bea365f7abdf410fc9961f6ac3f91e71d0d9c8d4d2504f674ed1c`

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