Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4841ede0a3fadbb…

MALICIOUS

PDF

73.2 KB Created: 2021-03-24 20:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18da428fb3a2f2f8f6faf6b490c74fc7 SHA-1: 91e6b007ca3a5f8e75ccd0c20dda59ccb8f0597d SHA-256: f4841ede0a3fadbb3bdd1bb06b9d55a15d4e66e20c1a77abde234a33f3af617f
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=mitosis+worksheet+and+diagram+identification+answers
    • http://sozimaxetupow.mywebcommunity.org/gilonasegisemuruvoj.pdf
    • https://kafolegilu.weebly.com/uploads/1/3/2/3/132303068/xamiwajotejaza.pdf
    • http://nakotigolajeg.scienceontheweb.net/nexubudumugotaruz.pdf
    • http://allroadkamchatka.ru/9042537906932tf9.pdf
    • http://tetupamino.mywebcommunity.org/tubajazipepovudepamafutu.pdf
    • https://lanekugufer.weebly.com/uploads/1/3/5/3/135351315/rekofulafawa.pdf
    • http://how2clever.com/applied_calculus_5th_edition_answers30l7i.pdf
    • http://wapividazofar.scienceontheweb.net/10648510537.pdf
    • http://kidobujugi.mypressonline.com/55214987680.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c76a4f3-ec6e-4f65-9ba9-a58979bb0c58/maytag_bravos_xl_washer_issues.pdf
    • https://uploads.strikinglycdn.com/files/d1657e50-996f-45b1-b1e2-29a7e25e11da/xanironukekutowexibon.pdf
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_ec6e70ec440c41d2a3e173166cdd4075.pdf?index=true
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_e9f3af4004794e34b879443545133b50.pdf?index=true
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_7af5cb7e1b7948a1b32e2233cbc42499.pdf?index=true
    • https://uploads.strikinglycdn.com/files/442f6c48-81be-4ecd-b2f1-22375aaa7379/19405379899.pdf
    • https://uploads.strikinglycdn.com/files/a6e02dea-ece5-4c64-9214-b35d7fdaba3e/when_will_season_4_of_sword_art_online_come_out.pdf
    • http://dogufisojorosef.epizy.com/pepow.pdf
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_eac358c7db774898aed1fc0456408784.pdf?index=true
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_55150dae126c47a28e941b5a88cb97ce.pdf?index=true
    • http://zusomiverufal.rf.gd/tupumu.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_off0000df8c.bin
6480fee6054341a2f1893f314a86af60404e85ee48e69754dc9aebaf1542f4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 5564 bytes
font_01_sfnt_off0000f270.bin
40faa182e9976414a8d00695c65c4d2a0dc1da9d0419dbb5eb54e0686d3b9465		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 10728 bytes

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