Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ca0a2d56d8a50…

MALICIOUS

PDF

72.5 KB Created: 2021-01-25 20:58:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c0ff8f61cb30423fc94cd4c9904630fe SHA-1: 40ca54b510452196be1aaa2f2ab2af637fe18c1d SHA-256: 5a3ca0a2d56d8a50119bf299751d7cafe5904a4f20f6a8a4f6f75438baf88a2e
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with the primary one being https://jacksth.ru/123, likely leading to a phishing or malware distribution site. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external sites.

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/123?utm_term=dragon+ball+z+devolution+super+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425726/normal_600c7be5874f9.pdfIn PDF document text
    • http://hookup157.site/mckinsey_insights_retail5ggwm.pdfIn PDF document text
    • http://amaryllis.space/femesiked345ed.pdfIn PDF document text
    • http://nature-ital.space/zopemifoforotad0yavg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_6005ca81b879a.pdfIn PDF document text
    • http://rmk4sale.xyz/we_wish_you_all_happiness_your_marriageo5mud.pdfIn PDF document text
    • http://gloslides.com/ludo_classic_board_game_free_dice_board_games265pf.pdfIn PDF document text
    • http://zemimumaloger.iblogger.org/fizemawakudajub.pdfIn PDF document text
    • https://cdn.sqhk.co/titabofasika/wMhjgfC/43263284486.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5ff13441298fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feeb9ab66fbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473432/normal_6007ad7e7ef94.pdfIn PDF document text
    • http://insta-sale.site/447186826324pgov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_5fd735365d68b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagugatukosag.epizy.com/nobomedisodeziteduxija.pdfIn PDF document text
    • http://riwexakax.epizy.com/computer_full_form_of_crt.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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5556 bytes
SHA-256: a9e05b81ca3118c95221b5a4ad9f74b332f315b4734767038a938834c8c141a2
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 10044 bytes
SHA-256: b1d135c4ff6dd11a4028babafc7f17cba04f632bf8fb1e486e3d231cfe309241