PDF malware analysis — malicious · b27c6d4717525b38

MALICIOUS

PDF

96.6 KB Created: 2020-11-10 15:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 616335b1f759a6e68dabc5e6e6946a7a SHA-1: 98ec08d63bdab924a31eeccd5fb72cb708c7074f SHA-256: b27c6d4717525b3891dcac96485654212c841534f88dc51e98d2255040d00a3f

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 other hosting services, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/strik?keyword=uci+peer+tutor+chem+1a
- https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/jegugavewuvibar.pdf
- https://cdn-cms.f-static.net/uploads/4369307/normal_5f895e6f01705.pdf
- https://cdn-cms.f-static.net/uploads/4409096/normal_5f962b2c0a4a7.pdf
- https://cdn-cms.f-static.net/uploads/4417997/normal_5fa52bfd0356b.pdf
- https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/netisukozuzuvip.pdf
- https://cdn-cms.f-static.net/uploads/4379233/normal_5fa27ab967ada.pdf
- https://cdn-cms.f-static.net/uploads/4367643/normal_5f877909742cb.pdf
- https://juporolo.weebly.com/uploads/1/3/1/3/131380745/8580171.pdf
- https://cdn-cms.f-static.net/uploads/4388612/normal_5f8d526f173d9.pdf
- https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/bugezate_demivejono_vosipav_parovanagimito.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/jowutoneranemuk/subopemafavutavofox.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_off00014143.bin` `a9f7f7e039ae10da266a571f6aeb2c287a05b739003fb51d49a644e8d8b3c903`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14143	5004 bytes
`font_01_sfnt_off00015225.bin` `83a85fd5bda715d05e61396bdc388745a31211fe38392e8bb37c1a933dd62c89`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15225	10300 bytes

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