Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f898f9e74879a2…

MALICIOUS

PDF

74.9 KB Created: 2021-01-02 09:18:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cec68fb74193f505290c3417b68abdd4 SHA-1: 53c4d713f288c1656d2494277c07c09432c96fc8 SHA-256: 34f898f9e74879a26cc93b3c156c26e8b051f93a71659b765ea6a57eafd6b69e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links, one of which points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL `https://ggtraff.ru/123?utm_term=desert+sun+academy+pto` is likely used to lure victims into clicking, potentially leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ggtraff.ru/123?utm_term=desert+sun+academy+pto
    • https://cdn-cms.f-static.net/uploads/4467560/normal_5fa6b05b8942a.pdf
    • https://sewimewomem.weebly.com/uploads/1/3/5/3/135323120/zewilupuwaken_mimas.pdf
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/1f9b4bef89.pdf
    • https://zuwulixomelonib.weebly.com/uploads/1/3/4/3/134385653/97dba5500ea6e9.pdf
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5f929b9b084ca.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f882ea9665c4.pdf
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/4590197.pdf
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/jorabazenadi.pdf
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/tetujatelug.pdf
    • https://cdn-cms.f-static.net/uploads/4459636/normal_5fba8b619b17c.pdf
    • https://static.s123-cdn-static.com/uploads/4412757/normal_5fc875d895486.pdf
    • https://static.s123-cdn-static.com/uploads/4495400/normal_5fe03c5ad9e39.pdf
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/6e719f8d091d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gifojuxaxeva/nejeso.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.

FilenameKindSourceSize
font_00_sfnt_off0000e683.bin
150e8ecfe04bc52d1be471fa34c325f73e951f1c57bbc02e5e48d667c638b061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 5288 bytes
font_01_sfnt_off0000f87b.bin
49aa19fca8ca2f59235509aca149b9ac1886b8f2736b908594293897efe9601e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 11256 bytes

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