PDF malware analysis — malicious · aa17bff4eced1f9d

MALICIOUS

PDF

74.2 KB Created: 2021-03-02 05:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 87ce36353a6672eb84e03ec9c1a5d9c4 SHA-1: 4e663794ac138ab3e1fdbd2cb2786f4186f42ce1 SHA-256: aa17bff4eced1f9dd0e0f08b2a2cd7ef213001f685ef2bcd97c8b0f54b4d1752

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 of which point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to external sites, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://vilenefex.ru/wix?keyword=a+forbidden+rumspringa+pdf
- https://cdn-cms.f-static.net/uploads/4421341/normal_6022646e87fe5.pdf
- https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/bidekin.pdf
- https://cdn-cms.f-static.net/uploads/4381536/normal_60353c3c44229.pdf
- https://cdn-cms.f-static.net/uploads/4451208/normal_603d9acdbea78.pdf
- https://static.s123-cdn-static.com/uploads/4415045/normal_5ff48d32206c8.pdf
- https://cdn.sqhk.co/liregagibago/6zRAhbQ/54164953989.pdf
- https://benokonafininu.weebly.com/uploads/1/3/4/6/134606635/b0c54e.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/vuforewebub/9484397371.pdf
- https://s3.amazonaws.com/kaxukok/67258782996.pdf
- https://s3.amazonaws.com/xonaxevetaf/86740392295.pdf
- https://s3.amazonaws.com/fuvidokibet/figural_series_questions_and_answers.pdf
- https://s3.amazonaws.com/daniwodug/what_is_the_suitcase_size_for_carry_on.pdf
- https://s3.amazonaws.com/temujonuwu/yearning_for_the_living_god.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_off0000e4b0.bin` `a595c3c656fda9a35d4a7413b8a24d692978fd8134f3b255c30df2de3e83a15c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4B0	5456 bytes
`font_01_sfnt_off0000f720.bin` `e00646b1bef3c36777e8f3c6e13695eb94739c9bcebfdb28d41cb8eedd9ef28b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF720	11028 bytes

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