Malicious PDF — malware analysis report

Static analysis result for SHA-256 833bdbd9c30e5439…

MALICIOUS

PDF

60.2 KB Created: 2020-12-24 08:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ee7829078759bc09f5b710f17e3e7546 SHA-1: db9fbada45a6e5384739aa54fe1af6ef70a98a4a SHA-256: 833bdbd9c30e5439fcfed9a4923a60d3025d0a55cbf837b92e545d55c813a40a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript T1553.005 Disable or Modify Tools

The PDF file contains numerous external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to trick the user into disabling security software, a common tactic in phishing and malware delivery. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://trafffi.ru/strik?utm_term=bike+race+game+offline+free+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408991/normal_5fa72f1ec3eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fd7d8c2200a7.pdfIn PDF document text
    • https://wobanavemo.weebly.com/uploads/1/3/4/0/134096337/7727aaf82c69999.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/tadevewuju/tigovo.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/kadosekuweduminexag.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/transformers_combiner_wars_betatron.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/wewapanasagujelevagoxusa.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/media_player_classic__android.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/gisogef.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/rafozivegusinopufutokevid.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/sijobelinizutojebuxin.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/59798109339.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/brain_teasers_puzzles_for_adults_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/swot_analysis_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e39f9e8-8060-4c17-8695-ed578da62650/50689830126.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_off0000adda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDA 5500 bytes
SHA-256: e1bbf0ed3a045d52462ec4c7b40ebea5477ed7089c2d88ffd61b379f85506dc7
font_01_sfnt_off0000c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09E 10696 bytes
SHA-256: 204ae781ee5cd5c8486e3e279711ac000e98fdfa8644c30a69b407291b8c6394

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