Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a45523c53488d3…

MALICIOUS

PDF

74.8 KB Created: 2021-04-08 00:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ca395a79f901726e59597d16d0905a7e SHA-1: e538f1e5da619d5489be194bed96d94aa5734828 SHA-256: b3a45523c53488d3a38c563d40d53c09f920da7a21e040a3fdda541fd33694d2
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to 'https://vilenefex.ru/strik?utm_term=is+collar+bad+for+dog', suggesting a phishing or malware distribution lure. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, and the presence of multiple unknown URLs further supports a malicious intent.

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://vilenefex.ru/strik?utm_term=is+collar+bad+for+dog PDF link annotation
    • http://uspeh.icu/20640578892sy59m.pdfIn PDF document text
    • http://mazafaka69pussy.online/fodakejazazunajzmqvp.pdfIn PDF document text
    • http://fresh-ita.space/wezerojovsteq9.pdfIn PDF document text
    • http://thepropheticapp.com/pegotofumumaxunipuba4iyn3.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/gaxumagiwovawryswp.pdfIn PDF document text
    • http://reduslimitaly.website/lalisulogafuzefabegilubxwco0.pdfIn PDF document text
    • http://kernig.pro/personajes_importantes_de_la_epoca_colonial_en_mexico1fnuf.pdfIn PDF document text
    • http://interplast.ru/the_philokalia_the_complete_text8n66s.pdfIn PDF document text
    • http://atlas-copco.su/tohatsu_5hp_outboard_manualuxben.pdfIn PDF document text
    • http://vittorguxx.site/deltran_battery_tender_jr_6_volt7xkv5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sevoga/verufuzekuvemejevifazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd5ad29-c2f5-449a-a230-e47b14988186/54305700868.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/pilujox.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/xivajojopomej.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/arbitrage_crypto_platform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56886e4-733f-4239-9d10-04b6ebb705f5/verifone_commander_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86ed7e4-f21b-4074-8b0a-2cabc13cbfd8/64370492222.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/saeco_incanto_deluxe_espresso_machine_manual.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 5264 bytes
SHA-256: 19edd1cf23b1b6332c9ace656367cfdbda352cf4e3db5745040819eaf5593ef3
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 11252 bytes
SHA-256: d70cbb93684ba624850aeaae7fc9d90da6b4313ab76598b71ca812342a255f18

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