PDF malware analysis — malicious · 445389bcfba49c5c

MALICIOUS

PDF

91.5 KB Created: 2021-02-26 11:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 886e89e66c883f8f69856681b8f677dd SHA-1: 168f92b66d9c9dd7f320bb7f18ad613d970d89a8 SHA-256: 445389bcfba49c5cce4073f854a65b16bde552cb185d24896b906acacc93419c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The presence of multiple external URIs and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful content.

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-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://vilenefex.ru/123?utm_term=the+sacrificial+egg+story
- https://cdn.sqhk.co/risenulowo/co3DgoM/barbershop_cast_2016.pdf
- http://wupulij.22web.org/improving_sentences_worksheet_year_3.pdf
- https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/f741b4.pdf
- http://rawoxaxevog.mygamesonline.org/6876216760.pdf
- https://cdn.sqhk.co/pajijolabalu/Xjfgc9N/84992410621.pdf
- https://jizuxiragoleti.weebly.com/uploads/1/3/4/6/134639642/eecfa2d9e.pdf
- http://navevukosuso.mypressonline.com/texas_health_and_safety_code_section_822.013.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/penale/cbse_biology_notes_for_class_11.pdf
- https://s3.amazonaws.com/kegubinefuda/zowituw.pdf
- https://s3.amazonaws.com/zagapaxa/89922345586.pdf
- https://s3.amazonaws.com/ragejufa/a_que_se_debe_el_pitido_en_los_oidos.pdf
- https://s3.amazonaws.com/nazekisigiduz/nawilufipolu.pdf
- https://s3.amazonaws.com/xewamejixolefaj/lalarabiwojage.pdf
- http://laxuwesesanaw.rf.gd/39081878217.pdf
- https://s3.amazonaws.com/lunojol/36760485960.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_off00012a4c.bin` `7fb2af567ba14e71c731fa8ff9399b5487db4b8e5a79f167435fbc027f0eaac8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A4C	5192 bytes
`font_01_sfnt_off00013bf7.bin` `8ee65f5a34eb2c702bdf15695df366bdbd9457792afc842ac9551a8063a08003`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BF7	10972 bytes

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