Malicious PDF — malware analysis report

Static analysis result for SHA-256 143bfdbd1375e79a…

MALICIOUS

PDF

83.9 KB Created: 2021-06-05 07:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b5d2ad9917f7069f5976166820241912 SHA-1: 9f4b0cb1ec2e26088fc81126c4c29f4262dc7b63 SHA-256: 143bfdbd1375e79a703b79beba462ebc2d42620d9fb979279a38283e52d31fdd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://synerhu.ru/pbw?utm_term=geometry+ch+5+review+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fe1f79b88f5c.pdfIn PDF document text
    • https://juzasofudabin.weebly.com/uploads/1/3/0/7/130775050/5758466.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/31c219577b34.pdfIn PDF document text
    • https://bokonuso.weebly.com/uploads/1/3/4/6/134604328/jukez.pdfIn PDF document text
    • https://gipasutojemozup.weebly.com/uploads/1/3/1/3/131379868/sojuxejiwub_bekudibilesodu.pdfIn PDF document text
    • https://renobulog.weebly.com/uploads/1/3/4/4/134464004/mewubetiren_kapegugid_munod_bowidazepugun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457573/normal_5ffcd77303d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183ea470808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veweran.pbworks.com/f/colours_kannada_serial_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6f7083-0f7a-4559-a72b-abbd95c1d0f8/cant_help_falling_in_love_guitar_chords_beginner.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144470889/honda_cb_750_f_workshop_manual.pdfIn PDF document text
    • http://sorawako.pbworks.com/f/blackmagic_atem_mini_pro_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5936b6f9-be06-485a-b1b0-2bfe79d7e988/ejemplo_de_guion_de_una_obra_de_teatro.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/f/1418644260.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144636867/diet_chart_for_gym_beginners.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/78820908522.pdfIn PDF document text
    • http://letonepamusi.pbworks.com/f/ielts_reading_test_with_answers_academic.pdfIn PDF document text
    • http://gemometis.pbworks.com/f/how_to_boost_the_left_side_of_your_brain.pdfIn PDF document text
    • http://daridameku.pbworks.com/f/naruto_shippuden_ultimate_ninja_storm_3_pc_download_highly_compressed.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144427968/15.3_applications_of_genetic_engineering_workbook_answer_key.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_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 5416 bytes
SHA-256: 391c0354aa9d619084cd7ebd8f1b3f913691f951f79fa3c52fc774d558d86145
font_01_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 12064 bytes
SHA-256: 6da9021a7cbe1d593b5fca9aed97ea53af5a41e54115142d5c21ec9f6ad83bad

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