Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9059242ecc5094…

MALICIOUS

PDF

136.1 KB Created: 2021-03-22 05:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 567e94d60a6494aa1ab514746cea422f SHA-1: 799f221758b5c8ea01e1aab534347692b6422302 SHA-256: cc9059242ecc50940ab8e16599ee832554e867abb326ca73d1fc0655e3117134
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, pointing to various PDF files. The primary URL, https://nipisod.ru/strik, appears to be part of a link farm designed to direct users to other content. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it is used for phishing or distributing malware. No scripts were extracted, but the structure strongly indicates a malicious intent to redirect users.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=brown+vs+board+of+education+facts+wikipedia
    • https://cdn-cms.f-static.net/uploads/4477638/normal_601edc19e4ed3.pdf
    • https://cdn.sqhk.co/botonerepap/hcgdijh/maxpreps_soccer_rankings_ohio.pdf
    • https://cdn-cms.f-static.net/uploads/4392191/normal_602938ebf29d7.pdf
    • http://yatvoyya.fun/lajunolotutiverosobojlqe9l.pdf
    • https://static.s123-cdn-static.com/uploads/4420441/normal_5fc7a0488a575.pdf
    • https://cdn.sqhk.co/pitekofotada/jahd37h/8324367884.pdf
    • https://nodejobirutita.weebly.com/uploads/1/3/4/7/134748641/1585cb364d9a06.pdf
    • https://static.s123-cdn-static.com/uploads/4411686/normal_5fe03647750f1.pdf
    • https://xukonupuzifig.weebly.com/uploads/1/3/4/6/134621954/d738a5a9d938.pdf
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/ea729367e04ed.pdf
    • https://cdn.sqhk.co/kikolibub/8FS4jwg/wabatikilefijigedifanu.pdf
    • https://cdn.sqhk.co/mepowokugo/gbE05jg/property_development_business_plan_example_uk.pdf
    • http://forkidsshop.online/pokazizoxunenejetogifesiygbku.pdf
    • http://kprovk.xyz/joratite3e018.pdf
    • https://cdn.sqhk.co/loxusovi/ggdNfha/xomojunusanosodetepetixev.pdf
    • https://cdn.sqhk.co/xudekutof/jhU86id/36168622709.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/413c57fa-8f40-4b6b-b5c9-1f86e08b7879/40672758499.pdf
    • https://uploads.strikinglycdn.com/files/64cd53b8-592c-4f6f-9e08-dc5bb5e14357/kudomino.pdf
    • https://uploads.strikinglycdn.com/files/db708222-125b-49ad-9fc7-5c7e000fe875/verb_to_do_exercises.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_off0001d708.bin
50e8ce1cb3a6b914658d7fdf0bf21076267e735b7e3e57815df83a6d92b5799f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D708 5520 bytes
font_01_sfnt_off0001e9fb.bin
0eee7a20c7c7f390bfb7c9979b1b19ed7c19d57c0ad4d8fec6e01683e19cf11c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9FB 12028 bytes

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