Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b6d1c30232ab9d…

MALICIOUS

PDF

67.8 KB Created: 2021-04-03 04:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4320ff1168da6c0bc57fcb668ac79c41 SHA-1: cf5c05c192e91da66fdec2460cc49d66eb6ade8c SHA-256: 66b6d1c30232ab9d742ce681832808969a4963b11190360402e65f2ff46d43bb
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs that redirect to a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and a keyword that appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/award?keyword=4th+grade+math+word+problems+workbook+pdf PDF link annotation
    • http://dihtyar.online/nanomatebuhwya6.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/Jh8MhdG/city_driving_3d_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/ciajbYt/lee_telehealth_phone_number.pdfIn PDF document text
    • http://white-x.fun/gf07_mini_magnetic_gps_tracker_review1t7m7.pdfIn PDF document text
    • http://reassurez-moi-fr.info/propresenter_7_known_issues4p30r.pdfIn PDF document text
    • http://sodahq.pro/when_we_were_young_lyrics_and_chords_gk6z2k.pdfIn PDF document text
    • http://italiahot.space/speaking_of_courageb5med.pdfIn PDF document text
    • http://wonnaturila.space/vobanagetilolojenalopoxaerv3.pdfIn PDF document text
    • http://leomannapov.com/13300864430skthh.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/xizuxewapaxagugitimulabm0s1z.pdfIn PDF document text
    • https://pelazokud.weebly.com/uploads/1/3/0/7/130775509/jevagekixiked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_601598b2c56c3.pdfIn PDF document text
    • http://myirn.icu/lerarap62wk.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/gujed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457876/normal_60094dc12a05e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a191b3d-fdb3-4f79-9895-f58d7717b6aa/miwatinijerepafoname.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626bcc01-2e81-4f61-a630-d025f352987e/96626774183.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_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 5744 bytes
SHA-256: 1cfa0fcc0a79f8725ba88cea8a7cf3911f25a742c8767fabbe9f1199f0a5fa75
font_01_sfnt_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 10588 bytes
SHA-256: 7a9a0a4e5afad01098259d0696f63f2157c722eeca88e1c438479358aeee745e

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