Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c591ae654f8c671…

MALICIOUS

PDF

79.8 KB Created: 2021-02-27 09:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9792de8a81307c32c9f0ded69d2b69c3 SHA-1: 79e90897f46dc52b3cb30afad2515db71448935f SHA-256: 0c591ae654f8c671bf8d178b5dc7163258dc474136a50974db07c7c04fa84a14
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' suggesting a tactic to drive traffic to various sites. The document body, though heavily garbled, contains references to 'Whirlpool fridge freezer parts diagram' and the wkhtmltopdf tool, indicating a potential lure to disguise malicious links as relevant content. The presence of embedded URLs further supports the attack pattern of redirecting users to potentially harmful external resources.

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://jumiwimov.ru/123?utm_term=whirlpool+fridge+freezer+parts+diagram
    • https://cdn.sqhk.co/bidamasegom/Shhbhid/melody_definition_example.pdf
    • https://cdn.sqhk.co/tigixexaxi/WUkmtjN/1775_rebellion_vs_878_vikings.pdf
    • https://cdn-cms.f-static.net/uploads/4489993/normal_5fe86203f1660.pdf
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5fe00c2c5d454.pdf
    • https://cdn.sqhk.co/gukokefa/jcfgdie/master_car_climb_racing_mod_apk.pdf
    • https://jizesemud.weebly.com/uploads/1/3/2/7/132710762/lebidifepugamu.pdf
    • https://cdn.sqhk.co/nebafori/FSjhrge/88469203201.pdf
    • https://safesawugu.weebly.com/uploads/1/3/2/8/132814337/rejekizojej_bapajeriji.pdf
    • http://youralteragoods.com/murray_riding_mower_parts_near_meneww8.pdf
    • http://stebsmeh.space/24682761609f93my.pdf
    • https://static.s123-cdn-static.com/uploads/4449789/normal_5fff2b67e629c.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/cours_orthographe_francais_gratuitnod4c.pdf
    • https://cdn-cms.f-static.net/uploads/4481286/normal_602beea4b26a8.pdf
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/6455711.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/7764b4d10f56c33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lasesesavobopom.rf.gd/2019_calendar_excel_template_uk.pdf
    • http://mefexatireriva.rf.gd/assistive_touch_apk_for_iphone.pdf
    • https://s3.amazonaws.com/litunux/momuwerow.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_off0000fb2a.bin
6f2a6f2ff3b0ba6d8ecad6f97826b1962f77bed888020afe7cf87a282aca3bcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 5516 bytes
font_01_sfnt_off00010dd9.bin
a50b91a20ca1bc4d65988e22aba309cb9687bf1c9c3c2b570f139914216c7b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 10404 bytes

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