Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7a53ebbe334194…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 10:57:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0169980081e53837abb7608b700e695 SHA-1: 4ac986c91c6e3978ea381b1a16b70a2bd68b149a SHA-256: 4c7a53ebbe334194553f674153a5c95f6cd988a6586e3b8f33cbeb83031bf7f7
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, specifically pointing to 'https://jacksth.ru/strik'. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to 'energizer batteries', likely intended to trick the user into clicking the malicious link. ClamAV detection and ML classification further confirm its malicious nature.

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://jacksth.ru/strik?utm_term=are+energizer+batteries+the+best
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5fca1639ce2e4.pdf
    • https://zerimesatevig.weebly.com/uploads/1/3/4/8/134879836/fuwuluga-donovu-diviratonifipi-kevet.pdf
    • http://kejemuvewi.22web.org/dizegitejitepavotunibu.pdf
    • https://cdn-cms.f-static.net/uploads/4422637/normal_601a085a19a8e.pdf
    • https://taxupati.weebly.com/uploads/1/3/4/8/134891344/6362396.pdf
    • https://static.s123-cdn-static.com/uploads/4369318/normal_6002db4bf0e56.pdf
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5fe42a3beb3ee.pdf
    • https://cdn-cms.f-static.net/uploads/4457296/normal_5fd2e5324de71.pdf
    • https://wawedubogefolik.weebly.com/uploads/1/3/5/3/135391715/juwezumavusezela.pdf
    • https://cdn-cms.f-static.net/uploads/4413242/normal_602892cdc3e65.pdf
    • http://wotidoteked.mywebcommunity.org/adjectives_worksheet_grade_8.pdf
    • http://gexafozo.22web.org/54549873414.pdf
    • https://cdn-cms.f-static.net/uploads/4410962/normal_6037dcb8eb682.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://roxegubipav.epizy.com/reformas_borbonicas_economicas_politicas_y_sociales.pdf
    • http://zutugidod.onlinewebshop.net/que_es_la_introduccion_de_un_trabajo_escrito_ejemplo.pdf
    • http://galuvof.epizy.com/mixurogufogubefisi.pdf
    • http://gulagopafed.onlinewebshop.net/kusenoxemusedenaf.pdf
    • http://wuwedilejom.myartsonline.com/32506664770.pdf
    • http://vujuvisesakok.myartsonline.com/lp_askep_bronkitis.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_off0000fb18.bin
b6905a3917fdd8623b20733bdda359b04292625567660bd57bc0a4013a60385f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 5092 bytes
font_01_sfnt_off00010c6d.bin
5a6dbfff67d43604070b3af537e05d8865ebf38578478d3ec907478db5341ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 11396 bytes