Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ab5d197edae613…

MALICIOUS

PDF

70.2 KB Created: 2020-12-20 12:59:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b86a226edaf256950d5fc0303f59a97 SHA-1: 7818930b98f9d938e1da6cad44067fa3bf2fe7cc SHA-256: a8ab5d197edae613880954df9408edc86d87560575e47ba20ce584f0c6e1f441
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'trafftec.ru', suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=davie+police+department+fl
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5fbb05e170e24.pdf
    • https://diminulagiv.weebly.com/uploads/1/3/4/4/134489960/5aa5888356.pdf
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/mazeke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/besafefaf/18476238008.pdf
    • https://s3.amazonaws.com/jobavo/92764303209.pdf
    • https://s3.amazonaws.com/mozedijiz/9577642992.pdf
    • https://s3.amazonaws.com/juduk/39246711510.pdf
    • https://s3.amazonaws.com/wovitiku/bluetooth_driver_for_asus_x550c.pdf
    • https://static1.squarespace.com/static/5fc5c50e1c8c741314534cd3/t/5fcd6569978da30c56106897/1607296362120/20632252825.pdf
    • https://static1.squarespace.com/static/5fc109232cf09257bd6ccb44/t/5fc372f33485235c86331b8f/1606644468086/a_pal_for_gary.pdf
    • https://s3.amazonaws.com/pegek/voltage_drop_tables.pdf
    • https://static1.squarespace.com/static/5fc546b6a13a450bab114660/t/5fcb07dc7ab0f364aba53094/1607141340900/baby_names_with_meanings_girl.pdf
    • https://s3.amazonaws.com/wonoti/nudawipizel.pdf
    • https://static1.squarespace.com/static/5fc5168716f6d44b07d98e8b/t/5fc7f5a56145c6573782a5ba/1606940069813/foludumugovurudadil.pdf
    • https://s3.amazonaws.com/tosevud/einaudi_divenire_piano_sheet_music.pdf
    • https://s3.amazonaws.com/sazixipame/gigifotal.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_off0000d550.bin
48466ebfcebd8154f66cb9b45b16330f682f106d9aa4470169dc47cd71133f0f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 5180 bytes
font_01_sfnt_off0000e6ef.bin
f9ee12efdcc8d638e38f1b0846c690bd58ee8a3b3e7caa168683363691808b56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EF 10868 bytes