Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3882b174a7968b…

MALICIOUS

PDF

94.2 KB Created: 2021-03-17 03:34:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ed09dfaf7c98ffd46a6f7948a524443 SHA-1: dc8bf8729c6e7814df5b416b0e50bac5e9292a4e SHA-256: 5e3882b174a7968b3585c158c5aadaeb2d4183f7c380f0d449276aac0ce6d13d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm. One primary URL, https://dafemum.ru/award?keyword=quartz+pdfcontext+problem, is directly associated with the malicious classification. The PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/award?keyword=quartz+pdfcontext+problem
    • http://kidiwutimako.mygamesonline.org/artificial_intelligence_by_rich_and_knight_full.pdf
    • https://static.s123-cdn-static.com/uploads/4372085/normal_60054b40cc8f8.pdf
    • https://cdn-cms.f-static.net/uploads/4374682/normal_6037c571ae8d4.pdf
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5fcf46ffe1d50.pdf
    • http://vumogegotawugub.mypressonline.com/iowa_math_test_6th_grade_practice.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_6017a47f1bb76.pdf
    • http://parovosi.mygamesonline.org/hoover_steam_cleaner_replacement_pads.pdf
    • http://fojibewuf.iblogger.org/sample_police_blotter_report.pdf
    • http://fafesixokegigi.getenjoyment.net/reading_level_comparison_chart.pdf
    • http://lojapidabud.mypressonline.com/how_do_you_write_an_introduction_for_a_descriptive_essay.pdf
    • http://fukazab.mywebcommunity.org/45856239243.pdf
    • http://geloritiveda.mygamesonline.org/the_merry_adventures_of_robin_hood_chapter_3_summary.pdf
    • http://bisibometixo.mywebcommunity.org/punigefiguvu.pdf
    • http://vofufime.mypressonline.com/xoturexexubagideguvixe.pdf
    • http://lofajemami.sportsontheweb.net/can_you_trade_binary_options_with_td_ameritrade.pdf
    • http://ruguwafe.scienceontheweb.net/17559661813.pdf
    • http://bosuxezaxad.mypressonline.com/afcat_syllabus_for_flying_branch.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rosajeku.myartsonline.com/blockchain_technology_presentation.pdf
    • http://xezogime.epizy.com/rugiwitusinubabo.pdf
    • http://giduzorim.epizy.com/gololetekikoxuked.pdf
    • https://s3.amazonaws.com/lebejos/72132841661.pdf
    • https://s3.amazonaws.com/zuwosil/naniguvuramojefuxo.pdf
    • https://s3.amazonaws.com/woxewiwupir/man_is_the_head_of_the_family_bible_verse.pdf
    • http://tubujozuvos.epizy.com/62831136093.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_off000131a9.bin
519a63d0cbf20239cd4b58189796d8faea9d904a47c7d8650d4c02ad8f83bace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131A9 5440 bytes
font_01_sfnt_off00014423.bin
69e6a92de0b19c2f84ac44f8074850b349bf9361f4c8c68c5529a6c8168b1989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14423 11660 bytes

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