Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c34091de0e741e3…

MALICIOUS

PDF

65.3 KB Created: 2021-03-20 00:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65d275d9d9b53997879fc2ccf93905af SHA-1: 57cd91dd90892555a89c1910a436a6aadf2d1df4 SHA-256: 9c34091de0e741e3b0ac8615aa8a9ecd87f99382c5c56ec0cb8cb6eb7d327460
196 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, including a link farm and an invisible link to a suspicious domain, indicating an attempt to redirect users to potentially harmful websites. The presence of PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://golowaki.ru/wix?keyword=hack+%252A%252A+miutets+in+iready
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/suvibefi.pdf
    • https://cdn-cms.f-static.net/uploads/4485801/normal_603def2d3dff7.pdf
    • https://cdn.sqhk.co/matajikiwov/Rjaq7hc/sniper_ghost_warrior_3_review_after_patch.pdf
    • http://bilkaita.space/amortissement_linaire_exercicen6pl8.pdf
    • https://cdn-cms.f-static.net/uploads/4453142/normal_60317e9b8555f.pdf
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fdbfc34ce6d7.pdf
    • https://cdn-cms.f-static.net/uploads/4454167/normal_6039e18ed380a.pdf
    • http://fineagencyy.com/mutoktphan.pdf
    • https://cdn-cms.f-static.net/uploads/4366357/normal_60323431588a2.pdf
    • http://dronextactical.xyz/big_green_egg_accessories_xlqxwy6.pdf
    • https://cdn-cms.f-static.net/uploads/4417030/normal_60173a5367e1c.pdf
    • https://static.s123-cdn-static.com/uploads/4366047/normal_5ffb7ec1a4b5f.pdf
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/betikuw_wobuveturefa.pdf
    • http://securityofusersdevicesonline.site/casio_g-shock_gw-9400-1x3kah.pdf
    • https://cdn.sqhk.co/kekotenonaxu/ggjdqgg/vipuvedatedasufideperav.pdf
    • https://cdn-cms.f-static.net/uploads/4391303/normal_60472663b9b40.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_28c51be9efe64358a991ef39b5fe19ef.pdf?index=true
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_011dde459ce74f758409bf5de9af5540.pdf?index=true
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_4bd134affdcb4bf8bbde55e77ed6590a.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_off0000c681.bin
6d0fb8917bda3d835d28e3d1441c4d067c3164602f5fa25433bba4b466ffb5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 5248 bytes
font_01_sfnt_off0000d85b.bin
5c88a23717f8ad0070249b94c2b96ab67d13a7aff301e7fe692572e73437fc9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 9484 bytes

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