Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb09b1db8c3cbe7…

MALICIOUS

PDF

57.7 KB Created: 2020-12-21 09:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c30dd5649fe739394697bc99e8af5418 SHA-1: 6f5bb23a436a33c0843355cb37dc307057e45940 SHA-256: dcb09b1db8c3cbe79cdd2e0ec762ad299395db2ef7a460bd675cf476b00a0b2e
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that masquerades as a download for a Minecraft mod, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF_URI heuristic directly points to the suspicious URL, which is the primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://trafffi.ru/strik?utm_term=mod+master+for+minecraft+pe+apkpure
    • https://static.s123-cdn-static.com/uploads/4388627/normal_5fdf1757b37ff.pdf
    • https://cdn-cms.f-static.net/uploads/4459641/normal_5fd89649329f7.pdf
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8752e234470.pdf
    • https://static.s123-cdn-static.com/uploads/4408983/normal_5fcfa2054e335.pdf
    • https://kuvegegujumil.weebly.com/uploads/1/3/4/3/134367432/1016233.pdf
    • https://cdn-cms.f-static.net/uploads/4388598/normal_5f8e3c03d8b2b.pdf
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/726298.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fa8d6479dcd3.pdf
    • https://luvumape.weebly.com/uploads/1/3/4/4/134438520/6eb6ab0.pdf
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fb443dcbfd83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/79d01c94-8aaa-4ada-9020-8e4aefe95649/consumer_behavior_building_marketing_strategy_13th_edition.pdf
    • https://uploads.strikinglycdn.com/files/1aa8b3a4-eb85-4ffc-8b92-2d188474ec19/wizidemokogufipofopofoz.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_off0000a935.bin
d0924f57bf15d7cf1c773a32149251d15d796ebab340d146c679c0041228d3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA935 5336 bytes
font_01_sfnt_off0000bb56.bin
5e8420a57386ef1347d7435d1188c6be5ee21285c76a4d590e665bb311bddf70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB56 9036 bytes

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