Malicious PDF — malware analysis report

Static analysis result for SHA-256 1393d714cb6c6a48…

MALICIOUS

PDF

72.9 KB Created: 2021-03-14 19:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6956c4e98dd17bc8c71da0af5f4c5dd SHA-1: e62fd931c6f6915b4cef5deafa6537c737cb1ad7 SHA-256: 1393d714cb6c6a483de72222382e94eead87dff3fb52acbb539b8fea80a51a5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

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-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://nipisod.ru/123?utm_term=mole+ratios+in+equations+worksheet+answers
    • https://cdn.sqhk.co/negolura/iaJieVm/12007035045.pdf
    • https://cdn.sqhk.co/lobinazema/bpiaihg/52207191170.pdf
    • https://cdn.sqhk.co/lorotukogof/drjdicH/cricket_match_game_for_pc.pdf
    • http://indital.fun/imagine_dragons_believer_sheet_music_easy1f1qc.pdf
    • https://cdn.sqhk.co/metumolalub/jTibhaV/versatile_sew_in_for_short_natural_hair.pdf
    • https://cdn.sqhk.co/dasadogiso/gJsggjg/gevezovesagixubero.pdf
    • http://potenciy.xyz/landscape_architecture_autocad_blocks_free4lgd4.pdf
    • https://cdn.sqhk.co/pabelemusib/chhD6hc/werewolf_word_game.pdf
    • https://cdn.sqhk.co/balaragu/CpKj9jc/sirasoxutapapugiso.pdf
    • https://cdn.sqhk.co/jazepoxamib/Tahdhja/xawavomezomulewupove.pdf
    • https://cdn.sqhk.co/ragejeli/gdtjhjd/metal_soldier_stickman_project.pdf
    • http://tefuvawilutir.mypressonline.com/wisiwubejob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_104a250fbe8b4f08a4eee0a030b1a12b.pdf?index=true
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_4e3be38bd3174851afec002bce61a134.pdf?index=true
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_0c11332ddaaa4154a82fc60524f7c083.pdf?index=true
    • http://wojibikifi.myartsonline.com/fawurefagiwifatisumozobu.pdf
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_931423a44d8a40849d9a382a4e62442a.pdf?index=true
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_bd8102c4151c47fc88b21794f6628af1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de15.bin
1b5d827f48183c012e62c147773fc8617e890eada57b2b4f7a13db5f34e489ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 5060 bytes
font_01_sfnt_off0000ef62.bin
8a2955d3d90af7aedd558b04d10e8f1408b320dad0063276e825d87c819c6747		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 10672 bytes

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