PDF malware analysis — malicious · 7ee7b73bb90ccd13

MALICIOUS

PDF

68.9 KB Created: 2020-11-11 22:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 721e58c60e382d323c8a0f7bee5ea2cb SHA-1: 142267fb6c0820d18147ab315b2b7346d4e155de SHA-256: 7ee7b73bb90ccd13344f4311f208e96ccd1adf0b1bb51286d82c463e16dba5fe

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 as a link farm, pointing to various PDF files hosted on external services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to potentially harmful content.

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://traffine.ru/aws?utm_term=english+grammar+test+app
- https://kapomubevobi.weebly.com/uploads/1/3/4/6/134681937/6517021.pdf
- https://cdn-cms.f-static.net/uploads/4412584/normal_5fa33e4447bc3.pdf
- https://rofipufexorijol.weebly.com/uploads/1/3/4/6/134656377/fuvoxegunujonas.pdf
- https://cdn-cms.f-static.net/uploads/4391621/normal_5f9c1792a575c.pdf
- https://cdn-cms.f-static.net/uploads/4386073/normal_5f907bddc5710.pdf
- https://cdn-cms.f-static.net/uploads/4369331/normal_5fa60c5b2471d.pdf
- https://vijipivefewari.weebly.com/uploads/1/3/4/6/134624644/tonix-wegevizejazawe.pdf
- https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/sasuwufamividulu.pdf
- https://cdn-cms.f-static.net/uploads/4388046/normal_5f979679c3451.pdf
- https://cdn-cms.f-static.net/uploads/4381082/normal_5fa014ff5b9a7.pdf
- https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/bukiri_riwolipariwoje_vaxovopob_tunavojorud.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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_off0000cfd1.bin` `800eda4a438fd871498444e331e359d3b6c7f97c7689c553da569a285c132439`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFD1	5192 bytes
`font_01_sfnt_off0000e152.bin` `006e1a67e459cad73eb15cb6129b1a4fc5e7a6779cbefa1f66055e3286915c03`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE152	11144 bytes

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