Malicious PDF — malware analysis report

Static analysis result for SHA-256 167ef0907ecaa107…

MALICIOUS

PDF

67.7 KB Created: 2020-11-25 19:04:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5c708ac7c286122b02bf37ce0439492d SHA-1: 7a1680512363860cb719c9404e956dc9270d6905 SHA-256: 167ef0907ecaa1070e04a64341863780cb2b59e3de301c2ec9724287e50a0314
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to bibliographic references, likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafficel.ru/aws?utm_term=referencias+bibliograficas+apa+de+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f87460786cb3.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/gozanurenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5fb698386d943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_5fbaaa658fa81.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f98927f3cb52.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/rekawexuretowo/emeryville_ca_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2101dec-9647-4e40-91b5-6ce194afac45/toshiba_satellite_bios_update_linux.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/canopic_jars_information_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4099eaa-cd00-4101-93f3-cd8349112d50/83223508489.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/kelizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5f5ef52-77ab-40f4-8551-a806900e22c7/17301317736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039c0ff3-9ffb-42b7-ac03-d1e79a76638b/bexixatepogusologixovisu.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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 5472 bytes
SHA-256: e5b74a1b2265fbdc1c5d216f3f8d03093c5205a97b796c3d1871d2768da74467
font_01_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 11140 bytes
SHA-256: cf1ceb91af47b8f0172a24a6b3ab4adf1afd04f709ddc904c6c6b3ae51dc231c