Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ebf7d3ec57a631…

MALICIOUS

PDF

68.2 KB Created: 2020-12-31 15:06:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28cd33a18b9545f2ad758bb0da2dc993 SHA-1: dfb24813fb9f953e9b23ee9a6e8ff382ce9824a6 SHA-256: e4ebf7d3ec57a6316658e8b803a4089ece213f226716e4b1d33fde44cf3237c6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a link farm and a prominent URL suggesting a lure for downloading Minecraft-related content, which is a common social engineering tactic. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute commands, further supporting a malicious intent to trick the user into performing an action that could lead to compromise. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://trafffe.ru/strik?utm_term=minecraft+world+edit+download+1.+16
    • https://mujavipaw.weebly.com/uploads/1/3/0/8/130874121/ad5c7638ade.pdf
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5fc7923e8e6d0.pdf
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f956ce0beaaf.pdf
    • https://static.s123-cdn-static.com/uploads/4446765/normal_5fdc9b154439d.pdf
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5fbc3f540f993.pdf
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f9bb5b2b5701.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cdd19edb-afcf-40ed-a26d-7005bc5d5558/bounce_back_loan_barclays_application_form.pdf
    • https://s3.amazonaws.com/vaxebisapesi/south_park_wheel_of_fortune_episode_number.pdf
    • https://s3.amazonaws.com/zeworibuzoza/47357185633.pdf
    • https://s3.amazonaws.com/zaxawetawupo/46527943891.pdf
    • https://s3.amazonaws.com/xutomoxu/farlin_breast_pump_manual_review.pdf
    • https://s3.amazonaws.com/laradusa/wifobenepisofafobilufu.pdf
    • https://s3.amazonaws.com/nupotukig/mejuveturozosi.pdf
    • https://s3.amazonaws.com/fofeguj/consumer_reports_best_vacuum_2018.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_off0000cdeb.bin
9535263d1a01ef7e63ba7812db0038a9671d895f153cebab07d6e4d96a60260e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 5172 bytes
font_01_sfnt_off0000dfba.bin
c41a0237e0d4116b3a1471b5f4d5e2ceb8f5dd1be458a4324e5d86e5f68c45f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 10600 bytes

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