Malicious PDF — malware analysis report

Static analysis result for SHA-256 452ba7674cf9bdbb…

MALICIOUS

PDF

100.6 KB Created: 2021-02-23 09:56:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c256c3996684ec567f00805711370c79 SHA-1: ed8ecf91e4c93b76eb66373cd6adc337503fcb15 SHA-256: 452ba7674cf9bdbb90d82d56a476b88ebc4be735ac69b9d6dcfae3d2bf2ec285
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a link farm, with one specific URL pointing to known malicious redirector infrastructure. This suggests the document's primary purpose is to direct users to potentially harmful sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=electric+man+round+5 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5fed2c861ac17.pdfIn PDF document text
    • http://i-men.ru/88615158615hzwv6.pdfIn PDF document text
    • http://lovemecompletely.com/download_game_stickman_clash_mod_apk_android_1omxvy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_600763e80a677.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/f72qwxE/empire_conquest_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/QQgjgdR/strategic_leadership_theories_and_models.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_600816c45cc49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fdfd76600f82.pdfIn PDF document text
    • http://goloszauniver.fun/xidiburezopesonarakuwawogo3syy.pdfIn PDF document text
    • https://cdn.sqhk.co/gevolonovare/7QgfBgx/ram_drift_car_simulator_unblocked_games_66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_601889f97722b.pdfIn PDF document text
    • https://venefenotufawu.weebly.com/uploads/1/3/0/7/130775800/8606edb2bbd3d5.pdfIn PDF document text
    • https://bobifadilow.weebly.com/uploads/1/3/5/2/135295989/c51059d1.pdfIn PDF document text
    • http://clyb-wylcan3.space/pujebojokajer7m6c.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/mexijegedakol/acura_nsx_buyers_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/lazikuwugazisojagakefaga.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/fieldglass_withdraw_timesheet.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/adolescence_developmental_psychology.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_off00014e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6C 4988 bytes
SHA-256: 859cd1f587eecc8aee125af421ff8e50fd9c94ea5aab3e121426c0552ae9a61e
font_01_sfnt_off00015f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4E 11028 bytes
SHA-256: 40b6191dedf1374b0cfc8b2c0ed5a86daf5c2b2173a4a06b0b0ac4705a70ec8a

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