Malicious PDF — malware analysis report

Static analysis result for SHA-256 02183b5e4cdbf42d…

MALICIOUS

PDF

62.2 KB Created: 2020-12-21 22:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00601a179fa4c2c6c2b3e00de65e984f SHA-1: 7778dba71f3f06bcab3e7d7bcd2f5770ee2a31b2 SHA-256: 02183b5e4cdbf42d4f20e0bedecbc92e5d660d4c8a61be8e026efe560fa76d28
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The presence of embedded URLs and the ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=liquid+ironite+for+lawns
    • https://wejusapud.weebly.com/uploads/1/3/4/6/134614256/dunuvo.pdf
    • https://cdn-cms.f-static.net/uploads/4481418/normal_5fac1c556ad97.pdf
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/kebinu.pdf
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fadce525c5d9.pdf
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5f972bfcd4fd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fedure/cash_flow_from_operating_activities_balance_sheet.pdf
    • https://static1.squarespace.com/static/5fc34a14bda9c57a97cd8cb5/t/5fc8a180970db930d9c5802f/1606984064652/ringtone_2020_audio.pdf
    • https://static1.squarespace.com/static/5fc79b152da0933358952f14/t/5fc8582313f8d93bf201b398/1606965287135/video_player_all_format_for_windows_10.pdf
    • https://static1.squarespace.com/static/5fc1999f5e8e827d4292cb4b/t/5fc422d33570fb44d18544a5/1606689495306/89360203149.pdf
    • https://static1.squarespace.com/static/5fc4e694085bf90c0e16c363/t/5fd17e3bae71ea6dd3167061/1607564860050/red_blue_light_themed_gift_basket.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_off0000b8ad.bin
3fa63a7e695576a798a9d5f7e2c8e462e3f856aeb706eb7391fd672237027f68
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 5060 bytes
font_01_sfnt_off0000ca08.bin
0aed728234f2c72839ae077bc02ac71e2657a5812e3b8319443fbb780447829a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 10256 bytes