Malicious PDF — malware analysis report

Static analysis result for SHA-256 7450efe81e594739…

MALICIOUS

PDF

84.6 KB Created: 2021-03-19 06:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6be9980deb1c95f6c1c235cbe3f35e SHA-1: 150bde7b4637a09b76e04a9d0907d71bdfcc3385 SHA-256: 7450efe81e594739603194968722ba021728b207761bd065cfd06e1f9c2382ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nipisod.ru/123?utm_term=hairbrush+song+sheet+music
    • https://cdn.sqhk.co/fabetojowuje/jiwghra/vewoloferubikeliguvozab.pdf
    • http://vatamuvemazaril.sportsontheweb.net/brewers_2020_schedule.pdf
    • https://cdn-cms.f-static.net/uploads/4372702/normal_604058c3d6727.pdf
    • https://static.s123-cdn-static.com/uploads/4470828/normal_6000327388947.pdf
    • http://kadaxejob.mypressonline.com/xelenibivutupemogaf.pdf
    • http://sumodena.getenjoyment.net/kupujepik.pdf
    • https://cdn.sqhk.co/movumatoz/kjiPG16/76810851583.pdf
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/04e2f1834048d.pdf
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/6931382.pdf
    • https://cdn.sqhk.co/doxurozupu/KUhfUcU/home_inspection_schools_in_south_carolina.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://62bfe9e3-d01a-456c-9d14-3ac71290fd99.filesusr.com/ugd/cfe640_e4c254aecac64d5694ae3068c62671f6.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85d.bin
2d0cc0928f49ab3c87bc326bf1f65698cd320a521b11743e88a997204daa2333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5284 bytes
font_01_sfnt_off00010a30.bin
711499ed3675e90da7452b1c773ca282c7d969e4436a0858fba214e6f37abfcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 11328 bytes
font_02_sfnt_off000130b2.bin
b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 16100 bytes

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