Malicious PDF — malware analysis report

Static analysis result for SHA-256 411e1664b2468930…

MALICIOUS

PDF

71.9 KB Created: 2020-12-18 19:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5d1170db2b53be1a75c5bd007349bf2f SHA-1: 2b797cbd84378c7eb35f94d310dcfe5addd5621c SHA-256: 411e1664b24689306cbfb65a716ca3e09db8167e692a4c6ac3620757e5beed71
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a 'Python data science handbook'. The presence of multiple external PDF links, some benign and some unknown, suggests an attempt to obscure the malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://ggtraff.ru/strik?utm_term=python+data+science+handbook+pdf+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390052/normal_5fba8df23c8a9.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/5f01512803a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419423/normal_5fac5ba34db78.pdfIn PDF document text
    • https://likosevatifipol.weebly.com/uploads/1/3/4/5/134584064/demamaduno.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/ddeb325c006a0ef.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/ruzaganog/business_development_manager_cover_letter_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33b8b3dfdd95b60e431f6/t/5fc53dc9cb3e0f5771fa824b/1606761930346/the_hacker_playbook_2.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfbe2c7afe470b5566d7d/1606220776160/dragon_village_m_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/baxter_institute_international_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/female_reporter_on_cbs_sunday_morning.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/subokevidadevojumaburanu.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/84263890544.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbceed573299f0c543888c8/1606217429260/last_day_on_earth_bunker_code_june_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 5904 bytes
SHA-256: 85fbd0352795dbf5a86a45a7e421508fd3b04f51591557a613895c2a565f4bee
font_01_sfnt_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 10836 bytes
SHA-256: ae3b9b7952a6161f175bf7c096d5edf5d6f1e4a121fbce8fce2dd764012edebe

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