Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8f50b6c38ddfa8…

MALICIOUS

PDF

81.6 KB Created: 2021-04-02 18:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fcd6c7dca85e5ebd9cf24b21f286d1f7 SHA-1: d37fb67c8e23d00825d8c94ac55238c6c1f83db7 SHA-256: 1f8f50b6c38ddfa82547caef92df3504ed8c4a736f6940049b551edf5a373443
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The presence of these URLs and the PDF structure suggest an attempt to trick users into visiting potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zajinet.ru/award?keyword=wanting+memories+satb+pdf PDF link annotation
    • http://merovew.xyz/gapazuw75f8s.pdfIn PDF document text
    • http://copyrightnotices-form.com/14167324011wvj97.pdfIn PDF document text
    • http://terem.space/history_of_the_world_i_guess_bill_wurtzmthx0.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/TdPnhbp/notejuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5fff9a2180183.pdfIn PDF document text
    • http://santand-es.com/batawadujirukupovgqo7a.pdfIn PDF document text
    • http://lngcliente.com/5406660354w62eg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_60350736c40d5.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/bZthg3k/23561264987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_5fd33a336e24a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_60279291af535.pdfIn PDF document text
    • https://cdn.sqhk.co/foxidagon/eyigghe/2586516672.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/5bd509d.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/ajbjbj4/34__2018.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/xesut_zujuvikokeli_fetekos_fosufako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_1eea6a3504d54c4d823a603f6c04b2f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/ferry_ibiza_formentera_con_coche.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/old_cymera_app.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/1579906705.pdfIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_56bd1dbf3c244bf8bcbe004aa91918b1.pdf?index=trueIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_679c1231c99f4f70a4e570bced0b3d84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/edgestar_ice_maker_ip250ss_manual.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_f9ebb5e2e53f4cbb908f0e8e89e08996.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widofafane/16572091355.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 4372 bytes
SHA-256: 9eaba5b3c716b11694c564810e857a83bbab90166fa36b9566cc3382c1426286
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 5268 bytes
SHA-256: cc052f7c20a7e8e1ae64735518982a8c17182f7bd5eb5c9964eea6ba8e1ea4e7
font_02_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 11904 bytes
SHA-256: a6c25a9b92d9aaea029065c5fe43a94505da95ba2e6bd5f719fc48daccb69546
font_03_sfnt_off00012887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361