Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f338a57b7b900f7…

MALICIOUS

PDF

74.4 KB Created: 2021-04-24 19:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffbf93eeb1675fc9dc46f6ccc2e62f46 SHA-1: 7f02d6ff1c17d905181670d23a823748bf640585 SHA-256: 4f338a57b7b900f7175eac569e75181c551d4f4f3f444a1231a72a7c382e286c
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. It contains multiple embedded URLs, one of which, 'https://botokaw.ru/strik?utm_term=power+electronics+pdf+mcq', appears to be a lure for downloading further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than a standard document editor, which is common for malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=power+electronics+pdf+mcq
    • http://fosipuzo.mypressonline.com/dhl_air_waybill_form.pdf
    • http://zujewubowufonug.scienceontheweb.net/cambridge_english_advanced_2_2020.pdf
    • http://gepanukotex.getenjoyment.net/prevention_of_occupational_diseases.pdf
    • http://melidagerukebel.sportsontheweb.net/jidipuguvezurimijebizezi.pdf
    • http://dosefokinuvulo.mypressonline.com/besogexu.pdf
    • http://bewujasixi.mywebcommunity.org/hacer_aviones_de_papel.pdf
    • http://jabudapitu.scienceontheweb.net/tapaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_3cb3d92a0cf8457ea6f900e7d4b06fc8.pdf?index=true
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_1f3300c7f8f0467e80c14318241f2ddb.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/bazojevitutexesi.pdf
    • http://gakajitaju.atwebpages.com/45788881487.pdf
    • https://uploads.strikinglycdn.com/files/1f9397c3-4dc3-47c0-b90f-65ad265d5fbc/1971178980.pdf
    • https://uploads.strikinglycdn.com/files/fe2d8e11-3df2-45c7-8329-6642b4d6d344/plc_programming_courses_online_uk.pdf
    • https://s3.amazonaws.com/donarepemi/fidimelapago.pdf
    • https://uploads.strikinglycdn.com/files/c59a5f10-8a65-4015-af8a-46fa30bb408e/86982382711.pdf
    • https://s3.amazonaws.com/liwara/89872931589.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_off0000e41d.bin
988186e2c081aee3757b817cf766c92b8ab708330bf00a1fba373f2d7f08fbe1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5312 bytes
font_01_sfnt_off0000f62a.bin
fdaf99d65449663be031b5674b08ffccafdeff5fce0f307cc74310b214fbd331
pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10864 bytes