Malicious PDF — malware analysis report

Static analysis result for SHA-256 239f4a0eaf2e3428…

MALICIOUS

PDF

77.8 KB Created: 2021-03-18 23:18:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 436c8c22b5c8eba764599b6187c1922d SHA-1: b17c373637afe76c1102cc10ac56850335e55ba3 SHA-256: 239f4a0eaf2e34287dc1acddc150177f42c1b87351d5b365a5041e8b3472fe95
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru'. This, combined with ML and ClamAV detections, strongly indicates malicious intent. The embedded URL is likely used to lure the user to a phishing site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=how+much+is+cdl+training+in+ny In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fc9a157140fe.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/xps_15_9570_hackintosh_guide.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/61360666957.pdfIn PDF document text
    • http://burrrhey.tech/sebovurexutinulutalowjcfc9.pdfIn PDF document text
    • http://quickpapp.online/wufetenenudoxaderalolob56x2t.pdfIn PDF document text
    • http://zerkalo-fugicar.website/how_to_write_panel_discussion_questionszrkgt.pdfIn PDF document text
    • http://realwockyc.info/sales_volume_variance_formula74yqr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_601330179ac5a.pdfIn PDF document text
    • http://callipakk2.site/xifurefemupe63zu.pdfIn PDF document text
    • http://vovidumuf.22web.org/is_tig_welding_difficult_to_learn.pdfIn PDF document text
    • http://zoxenejuwu.iblogger.org/beginner_gym_program.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413570/normal_5fec287b7992c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_601b1ad45c02e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_602c9cb0d1c9b.pdfIn PDF document text
    • http://filuniguwol.22web.org/job_application_format_word_doc.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/belopudevuzuza/71653325660.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/why_engine_service_soon_light_is_on.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/tableau_vsepr.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/3813515556.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/subordinated_debt_equity_on_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/what_ink_cartridge_does_the_hp_officejet_5740_use.pdfIn PDF document text
    • http://zatajuvezutulo.rf.gd/78063467235.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/liwumikefinadezozif.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/difference_between_new_testament_god_and_old_testament_gods.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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 5508 bytes
SHA-256: 8398d5842362bd3057d2fef43f8803d4d930b05ec2300c686774a8271b57c69d
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 11092 bytes
SHA-256: 642f1d551cf8c69e6d46775d45e694d6a1a8ea628c02afe7e9c3c34ac307c3c7

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