Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3f1249fc6c7461…

MALICIOUS

PDF

77.9 KB Created: 2021-06-02 22:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f171b63aeb43d68fd98db70bfeeb124 SHA-1: 0e308c79ead1f1400e5004d3faede1ca76e8c5e5 SHA-256: 3d3f1249fc6c7461a41824b6fac489a0f6129a38373f45d83a2da7b20aaa76d9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://jumiwimov.ru/123?utm_term=graphics+design+tutorial+bangla+pdf', are likely part of a campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=graphics+design+tutorial+bangla+pdf
    • https://tevupuzenoxa.weebly.com/uploads/1/3/6/0/136009769/gajunujeduxabov.pdf
    • https://gilepinewuje.weebly.com/uploads/1/3/4/0/134096317/1150168.pdf
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/xafuwulu_fumifojexapikew.pdf
    • https://jisixeda.weebly.com/uploads/1/3/1/4/131409884/noburoz_lepunumomut_merusetoja_denakujineni.pdf
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/7903367.pdf
    • https://tozuriko.weebly.com/uploads/1/3/1/4/131437247/dopijutudajuz-miniran.pdf
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/tebosam.pdf
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/modajedawuxutiregowi.pdf
    • https://paraminukus.weebly.com/uploads/1/3/4/7/134705680/sotumo-nevusasezipu-bezodobuxit-sodepojewoguxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sutodoromar.pbworks.com/f/89914627747.pdf
    • http://mujefapufefi.pbworks.com/w/file/fetch/144516240/nova_what_darwin_never_knew_video_questions_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/05bc4a60-a9e1-4a68-b180-aa1b2119fa80/book_report_rubric_6th_grade.pdf
    • http://kedetuwi.pbworks.com/f/john_deere_425_mower_deck_belt_diagram.pdf
    • http://zowonixepor.pbworks.com/f/why_is_my_samsung_s7_saying_not_registered_on_network.pdf
    • https://uploads.strikinglycdn.com/files/27d84d8b-fe25-4c23-9ce0-9769778172d9/wuzovizosaxezi.pdf
    • https://uploads.strikinglycdn.com/files/23996e96-a8db-4b35-8854-094c2a9f28a4/54874104859.pdf
    • https://uploads.strikinglycdn.com/files/95b6360a-ac53-4986-a807-8f974a2e86cc/wulorabalisapapez.pdf
    • https://uploads.strikinglycdn.com/files/711fa9e6-455e-4805-b63b-2a8d1220d59b/kajemanaradugadelunak.pdf
    • http://bovojigu.pbworks.com/w/file/fetch/144418140/15246981713.pdf
    • https://uploads.strikinglycdn.com/files/024e3b72-7348-43a6-a889-b9f2819562b3/satisfya_mp3_download_320kbps_mr_jatt.pdf
    • http://siseraxoru.pbworks.com/w/file/fetch/144518724/arithmetic_progression_worksheet_class_10.pdf
    • https://uploads.strikinglycdn.com/files/df3c1357-5fe2-4214-a00e-5c01f59bdced/85571618456.pdf
    • http://gibuwodebu.pbworks.com/w/file/fetch/144496197/nozuperotozonoxalozaso.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_off0000f336.bin
37fda0f728a446f6eb8864de74bca7a642c2fa7d711f71e7fc53a27ac05d0bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 5588 bytes
font_01_sfnt_off0001062d.bin
3508a0fc5c3f2e8db444fca3ef3c392f7920aa09d38429589be70d2830a9c081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 10668 bytes

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