Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52f8283b0d75e59…

MALICIOUS

PDF

62.9 KB Created: 2020-12-20 23:11:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d5cf954920f16e1976071d628de71c4b SHA-1: ce592807761a301b13eb7a8894d4ba98bfda3700 SHA-256: b52f8283b0d75e59ae7e11303ab3e2de6fa43f42b958f4586aa0b37d942079e6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate malicious content, specifically a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

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
  • 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.
  • 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://traffine.ru/123?utm_term=earth+the+water+planet+worksheet+answers PDF link annotation
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/jamitifu_xebaliwo_xekuv_tasirasijex.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/dezevu_sagadov_donano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fa9d83b234d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_5f990971b9bbd.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/6501183.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/jutenojamega/4242545429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3c0665-3caa-4490-bd20-ee0df1bf597e/90169230155.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77a6e791da6493f6a9a22/t/5fd0f252e6e9bf57531ee2bb/1607529043651/car_games_play_games_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a84e1693-b42b-40ba-9bbe-47342748dc96/dw7187_adjustable_miter_saw_laser_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0691c-d04a-4538-b99c-c0ab90ac7b69/american_revolution_printable_worksheets_for_kids.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51ce4d26ff1194f8f2d2c/t/5fcc77409aa2de0c648c074f/1607235392552/lock_screen_wallpapers_for_windows_10_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b70157-5254-439d-921e-d3258e8d5ebc/84237207159.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a6398139af0376657f99/t/5fcbd85abce7087d1ae8da11/1607194715608/ice_hockey_training_exercises.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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 5020 bytes
SHA-256: fb814db9cf2ccdbf199252a9dcf3f51cf57f693def562c496bdf6a6acdc86d2a
font_01_sfnt_off0000cc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3E 10212 bytes
SHA-256: 64d8ee6119a7135ce0810d92c74c13c7c2aa4b4974bbb1da0da0da689567b4ab

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