PDF malware analysis — malicious · 4f46daa6108a43c1

MALICIOUS

PDF

70.1 KB Created: 2021-01-04 16:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 22ef6eca08e3146433aa763f966f71ab SHA-1: 7dc3b29d2ea7dd3287f027d2c859996729d94663 SHA-256: 4f46daa6108a43c1ff3cc2613fdd860db9a6e74da84ad94cbbf8956f36ba6d02

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Weebly and S3-based PDF files, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://trafffe.ru/aws?utm_term=oswald+demi+bold+font
- https://bivovupoxewoko.weebly.com/uploads/1/3/1/3/131380626/c40a9d.pdf
- https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/8501730.pdf
- https://nubajegi.weebly.com/uploads/1/3/0/8/130814178/febikarorovezolirowa.pdf
- https://xofijenafoku.weebly.com/uploads/1/3/5/3/135349300/digijozevun-vijulu-bezil-tobotuwazewadi.pdf
- https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/e0939f379.pdf
- https://vubumemor.weebly.com/uploads/1/3/4/0/134012760/8276058.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/geradi/85338448272.pdf
- https://s3.amazonaws.com/bifamomove/bpsc_64th_mains_question_paper.pdf
- https://s3.amazonaws.com/vaxebisapesi/pilobalifelagonotowotomop.pdf
- https://s3.amazonaws.com/dutimajizowa/sojas_wagle_s.pdf
- https://s3.amazonaws.com/ximupuv/69800822814.pdf
- https://s3.amazonaws.com/naxozelozude/ronomosekamimisow.pdf
- https://s3.amazonaws.com/sesijesule/apocalypto_2_free_movie.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d33d.bin` `d92b43d5734f53e3362d431b4ba27b3f91c0a4b89ddd2937cc698d94e0e6f967`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD33D	5216 bytes
`font_01_sfnt_off0000e4f7.bin` `1bf83871c8e00f4f756c4b50915a109de9aa5562fa386c906e75bb9f4151748b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4F7	11080 bytes

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