PDF malware analysis — malicious · 7a2c28e92faab6db

MALICIOUS

PDF

111.8 KB Created: 2021-05-27 08:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: b7cd509df7c1af668f012ac26b2dc075 SHA-1: cd68ab56a2ac97287385b14a9746c4964446ccca SHA-256: 7a2c28e92faab6db5eb5246a3119d5b5cb838c0c8b822f6cdebc752ecdab1e90

254 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external PDFs, many of which appear to be part of an SEO link farm designed to redirect users. The primary redirector URL is 'https://yafferge.ru/strik?utm_term=bible+book+to+read+when+fasting', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host these links.

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://yafferge.ru/strik?utm_term=bible+book+to+read+when+fasting In PDF document text
- https://cdn-cms.f-static.net/uploads/4416656/normal_604ccc5b9e55b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385213/normal_60127ef530038.pdfIn PDF document text
- https://vozedebilonede.weebly.com/uploads/1/3/5/3/135333302/guwopoku_beduzili_litaxol.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475203/normal_603e967110636.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452392/normal_5fd26f6ce74f8.pdfIn PDF document text
- https://nozojotama.weebly.com/uploads/1/3/4/5/134585139/70ba754c91a601a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4381536/normal_60380b1908c37.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4498842/normal_604ab88325d79.pdfIn PDF document text
- https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/notagakokowo.pdfIn PDF document text
- https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/xojuzujamatofu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420036/normal_6033b6831189c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4373511/normal_5fdf7ea63a1ec.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446174/normal_6039cc3aa1fbd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4466675/normal_5fe055fe63ea6.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/0553c6a0-4a7c-41ec-ae70-5dde1589c400/73718458352.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b75b331a-332d-4ebf-bd14-a8a2ef9d07b0/39654337767.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/783660cd-3002-4f96-a480-801de5e0524f/65270850285.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6dfb2c20-41b8-4973-ae0f-98d3721a867f/73378368231.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e9ab957f-0daf-4d75-a307-6ef7545c3e84/62133118417.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0001699b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1699B	5300 bytes
SHA-256: `c40fdeb30c02ace26da65268eeda7bfb30aa2273cdea220b3b380c12268a8607`
`font_01_sfnt_off00017ba3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17BA3	11700 bytes
SHA-256: `e58ce3c8b01f869fb8db02760d5d999e6ab2f5f7de670f8e9f6c3efc50e306a6`
`font_02_sfnt_off0001a241.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A241	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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