PDF malware analysis — malicious · 81b9b388096ff450

MALICIOUS

PDF

35.4 KB Created: 2020-11-07 07:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23

MD5: 334ab0edc595ce9ca1886c7c4ef6dfe5 SHA-1: 00879169dc87cd842830e1557781d1a1e030a1a3 SHA-256: 81b9b388096ff4505f66c4a2b9befade93f042c7d2e112c63d54a15bb528a49d

134 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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://traffking.ru/aws?keyword=danfoss+ra+2000+manual In PDF document text
- https://cdn-cms.f-static.net/uploads/4366354/normal_5f882fbb28ec5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372371/normal_5f9d2633ad9f0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372378/normal_5f8910c74a7c1.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://xanaledevevi.files.wordpress.com/2020/11/22463684557.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2768c4d8-bc9e-43e3-bb61-04cdfbff01ed/tejunivuvukasuz.pdfIn PDF document text
- https://semumawi.files.wordpress.com/2020/11/8950735449.pdfIn PDF document text
- https://s3.amazonaws.com/tekujel/87987246467.pdfIn PDF document text
- https://s3.amazonaws.com/sukobogixe/2484104870.pdfIn PDF document text
- https://s3.amazonaws.com/henghuili-files2/64619714741.pdfIn PDF document text
- https://jinojexofag.files.wordpress.com/2020/11/xerobikiranamusa.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_off00004d41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D41	5188 bytes
SHA-256: `91f8125fca9e936d1694458c2b0a0e81d8b39ceab0eddac3c74bd6f626afc171`
`font_01_sfnt_off00005ed5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5ED5	10204 bytes
SHA-256: `008d1a7bf035c58331d692056d602ea7a9a016fe55580661f6da3982ca3225f3`

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