Malicious PDF — malware analysis report

Static analysis result for SHA-256 8498a04c54f4ebfc…

MALICIOUS

PDF

75.5 KB Created: 2021-06-12 17:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ddb9c087504d77ea45f8a3dc2e995c89 SHA-1: 1cc06dd6f4ec96585c081fa655f85d00bdd3c97a SHA-256: 8498a04c54f4ebfc956c0255efb2bdc1b916ff01f13c9f01f25f71b036d146e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/pbw?utm_term=who+is+considered+the+richest+man+in+the+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467019/normal_60621b02e644d.pdfIn PDF document text
    • https://jokimaxe.weebly.com/uploads/1/3/7/5/137513409/9593fadc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464525/normal_5febfffc15918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410975/normal_6011584a58ff9.pdfIn PDF document text
    • https://fubuworarakej.weebly.com/uploads/1/3/4/1/134108970/vosam-wimuradili-fagebajikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_60c4172fe8369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459630/normal_5ffb13a032659.pdfIn PDF document text
    • https://wigemixez.weebly.com/uploads/1/3/4/2/134265991/7570385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/145155960/64782791418.pdfIn PDF document text
    • http://rimogeto.pbworks.com/f/what_does_the_white_heron_represent.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/f/club_car_ds_rear_axle_oil.pdfIn PDF document text
    • http://vulifib.pbworks.com/f/semewipemonipixeku.pdfIn PDF document text
    • http://lumoxag.pbworks.com/w/file/fetch/145170396/47336852854.pdfIn PDF document text
    • http://bajaduxaxusi.pbworks.com/f/free_psychometric_personality_test.pdfIn PDF document text
    • http://lekadebixe.pbworks.com/f/how_do_i_reset_my_panasonic_viera_plasma_tv.pdfIn PDF document text
    • http://komogabovuwa.pbworks.com/f/sitamowaxu.pdfIn PDF document text
    • http://sufasujozu.pbworks.com/f/dofimejider.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144422562/las_7_claves_del_exito_de_disney_resumen_capitulo_2.pdfIn PDF document text
    • http://giribuv.pbworks.com/w/file/fetch/144542691/fsica_halliday_resnick_5_edicion_volumen_1.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/30510890041.pdfIn PDF document text
    • http://genarozep.pbworks.com/f/cylinder_volume_and_surface_area_worksheet.pdfIn PDF document text
    • http://gaguseka.pbworks.com/f/how_to_fix_lg_washing_machine_oe_error.pdfIn PDF document text
    • http://lesokulovisu.pbworks.com/f/fast__the_furious_hobbs_and_shaw.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_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 5284 bytes
SHA-256: 206537e07afc23189869402308f70ad866540f221f7b6a53586d1a87e4b988fb
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10716 bytes
SHA-256: f12bf0be4dddd96dfd0a1c2d72489a7d075bceedaf5cfec788724d0853631ac7

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