Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d89ca9df418aa00…

MALICIOUS

PDF

76.7 KB Created: 2021-03-24 14:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a2c594a3bb2afe11c9847c2cd0ce19 SHA-1: 809e847a1933bc743e963ee5b50f029d3548c21d SHA-256: 8d89ca9df418aa009ee433ea763d3a4984c833160e7d1becf262eb27d48af032
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect the user to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=i+wish+i+was+strong+enough+quotes
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/lapap-pusebuvogewafo.pdf
    • http://fogejebimo.scienceontheweb.net/salabidujofunolegezen.pdf
    • http://kapovulup.mywebcommunity.org/davifemebazamawidunapuxu.pdf
    • http://papawugamajube.mygamesonline.org/duluweroketuboxem.pdf
    • https://cdn.sqhk.co/wukikanas/fhgNha7/vokazemetusemifeg.pdf
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/f0049c.pdf
    • https://cdn.sqhk.co/sejiragidu/ahgiith/71683826207.pdf
    • http://xijivedijimidip.mygamesonline.org/english_crossword_puzzles_with_answers_for_class_6.pdf
    • http://sodowetan.mywebcommunity.org/girl_boss_podcast_spotify.pdf
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/8191939.pdf
    • http://gazajujana.mygamesonline.org/70528678180.pdf
    • http://bigijawiv.scienceontheweb.net/how_long_is_hunger_games_catching_fire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nokiva/maxi_cosi_pria_85_3_in_1.pdf
    • https://s3.amazonaws.com/levovod/chandni_chowk_to_china_movie_moviescounter.pdf
    • http://xakagigoneliv.myartsonline.com/math_grade_5_worksheets.pdf
    • http://tumobuwixakeg.atwebpages.com/vujurujaworanevig.pdf
    • https://s3.amazonaws.com/ratixifo/police_report_for_stolen_ups_package.pdf
    • https://s3.amazonaws.com/fofeguj/implosion_apk_1._2._9_full_version.pdf
    • https://s3.amazonaws.com/muxegeza/larig.pdf
    • http://rixigor.onlinewebshop.net/seo_periodic_table_2020.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_off0000ef50.bin
83f315fdf24eecd7b5d6c072b481d3966a61e6b621ff4caed0c4b81e8b731416		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 5068 bytes
font_01_sfnt_off00010098.bin
786f960a857f058bf667f8c634d370af289cc9db26695bb535eddd54f3984adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10828 bytes

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