Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c13e6662f8e96a4…

MALICIOUS

PDF

81.6 KB Created: 2021-04-08 00:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e3907b663153ef120ba7a3468a41de SHA-1: 5c6470ce71187ccca49a3c7bff1af623b1cbfdff SHA-256: 9c13e6662f8e96a4c01123a7bb3356f57dab3d255f4145c981642a6822987c62
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate that the primary goal is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/strik?utm_term=who+am+i+-+ramana+maharshi+youtube
    • https://cdn.sqhk.co/mudemodox/Higzicw/zuzabusepagoda.pdf
    • http://prostotit.site/26219873253apqal.pdf
    • https://sudogela.weebly.com/uploads/1/3/4/8/134846286/kopujazubovegasati.pdf
    • https://cdn.sqhk.co/vitimosugu/hb8gjgf/48989196865.pdf
    • https://sofirutowik.weebly.com/uploads/1/3/1/3/131381411/roditiwi.pdf
    • http://medicalpracticementor.com/69657540703wwjv3.pdf
    • https://cdn.sqhk.co/kuzosexiwugu/fmkigdr/photo_lab_picture_editor_app_origin_country.pdf
    • http://megopoveguvujal.medianewsonline.com/87184181619.pdf
    • http://pemufosapakem.mypressonline.com/bessa_r3a_manual.pdf
    • https://cdn.sqhk.co/foxoxaze/h0igxhj/brasfoot_2020_premium_codigo.pdf
    • http://povisowalikim.scienceontheweb.net/97198129810.pdf
    • http://fomoregekamikat.mypressonline.com/bhu_ba_sociology_syllabus.pdf
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdf
    • https://kipofazusaf.weebly.com/uploads/1/3/1/3/131379409/3728800.pdf
    • http://healthyforczechrepublic.site/mailbox_international_woodland_hillsmyesb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/989003a8-7660-48dc-8356-3a4e8181adf9/91781424395.pdf
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_955ec01c1f4a4df4b20aac4f406e9bae.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_ac658039f66c46f3973e91634bcbf870.pdf?index=true
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_e74e54fbf3264a67af6d3b9355520f94.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_572e17437cf74b2d9107c6b06faf31ed.pdf?index=true
    • https://uploads.strikinglycdn.com/files/149462e7-d1ee-43c9-9188-c3b0ad7ea488/6844107274.pdf
    • https://uploads.strikinglycdn.com/files/cbf99b02-60dc-4746-9047-8b83ba971c3b/45329692918.pdf
    • https://uploads.strikinglycdn.com/files/2369e1c3-9e7b-435a-9292-c17479e552ca/44332535272.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_off0001033b.bin
d4792292c4af0467baf72035fbbad651c803f202a77a1b9dac985e16841facd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 5180 bytes
font_01_sfnt_off000114c5.bin
7bd7990d13616b77e60d59be577b230ac54275b8bcaf29f75b9fed8f5e7f205a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 10640 bytes

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