Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c26299a61054d5…

MALICIOUS

PDF

90.1 KB Created: 2021-03-20 07:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7ca46e048913939625b4801b5cf791db SHA-1: 2bc2ae173f20ec2d98101bc717b0a7715291be61 SHA-256: 55c26299a61054d598a8aea669901115403ec89323f6432c3980876e5cdff216
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document is part of a campaign to distribute malware or phish users, disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/award?keyword=american+english+file+starter+student+book+pdf+free+download PDF link annotation
    • http://buwovavozu.getenjoyment.net/31048377972.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/idiicgc/simply_piano_mod_apk_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/gjeK9ja/real_chess_app_free_download_for_pc.pdfIn PDF document text
    • http://varistop.site/pokemon_dark_rising_complete_pokedexzy1eh.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/tiralexuradezupegafura.pdfIn PDF document text
    • http://sfhgfje5df.xyz/27093359645x5qxk.pdfIn PDF document text
    • https://cdn.sqhk.co/futogifoku/iHZ36WJ/missing_411_movie_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/fagevibe/YB7gfmA/3d_shooter_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/gavezexu/hg8ieDe/22826254618.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/goJ1jhc/xamorutarawi.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/52050361984.pdfIn PDF document text
    • http://accueilcmb.com/61992019069idgjz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/nometukumek.pdfIn PDF document text
    • http://xizokenimufewom.atwebpages.com/candle_in_the_wind_piano_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/wizukiporebi.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/zegugaseketetufi.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/ripefupesazitifozib.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/bds_full_form_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/dekijutesewezesolora.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012e03.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E03 24360 bytes
SHA-256: cbfed7e2537b609fcac2d4edf87d4c2c6648e0da87d7d8d0cbd587acaff0f3e5
font_00_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 5856 bytes
SHA-256: d687ee7cb8583d1b3699a7ad5960101dd8a4bc0d007154357d056ef37fe6a674
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 15932 bytes
SHA-256: 83ece61872d354fa6b816d7bbb9d9f736414cedbdad69362796184a1a1374ae9

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