Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c193e8fbe615684…

MALICIOUS

PDF

75.8 KB Created: 2021-03-31 13:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4d05211c219981325b1523f2796ca6d SHA-1: e58904128ea8f88a449eaa858a5d205bebee259e SHA-256: 2c193e8fbe61568481ff2d558fbb018582107c715aa32a12be00bc00c221afa7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to assignment answers, directing users to potentially malicious URLs like https://mezovuduw.ru/wix?keyword=bmr+assignment+14+answers+cram.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/wix?keyword=bmr+assignment+14+answers+cram
    • https://cdn.sqhk.co/tefegegesuxe/bhbWjh9/super_dog_adventure_jungle_survival_kit.pdf
    • https://cdn.sqhk.co/fiporalisu/Xpjikjb/katewawijewedafezafujiwid.pdf
    • http://vataponuxizeliz.mywebcommunity.org/business_research_paper_format.pdf
    • http://bokaxakoz.sportsontheweb.net/3726653930.pdf
    • https://cdn.sqhk.co/lanuniwa/3IVNihA/free_gin_rummy_plus_coins_easy.pdf
    • https://cdn.sqhk.co/mojikeke/jr3jdxg/basketball_wallpapers_4k_download.pdf
    • https://cdn-cms.f-static.net/uploads/4496571/normal_5fd7d4fb48f23.pdf
    • https://cdn.sqhk.co/tubadaluzafu/Bhfhgif/zotozazubiranesafo.pdf
    • http://ruzamaji.getenjoyment.net/receptionist_self_evaluation_form.pdf
    • https://cdn.sqhk.co/lupobikud/jggg7jh/smithsonian_channel_plus_review.pdf
    • https://cdn.sqhk.co/turaxulefa/h0oOjgN/winatetikeziki.pdf
    • https://cdn.sqhk.co/ribuwikoli/iijgjek/facebook_admob_mediation_android.pdf
    • https://cdn.sqhk.co/vizefejij/JKxjfjd/pencil_drawings_step_by_step_nature.pdf
    • https://cdn.sqhk.co/xonipavu/gIhfhYW/nikepepexevuwi.pdf
    • https://cdn-cms.f-static.net/uploads/4451945/normal_603e654d0ba9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dezizogumeb.epizy.com/rainbow_study_bible.pdf
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_afe9d49ac7cd4655bb22dc48821ce967.pdf?index=true
    • http://pujusojup.epizy.com/le_guide_de_l_orthophonie.pdf
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_90b6f9a9306f45fab845de8ac8b9af6f.pdf?index=true
    • http://sukokovevaz.atwebpages.com/iowa_boee_folder.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_9ca8d4efe0804ed2aceff65e69737efc.pdf?index=true
    • http://vojilub.rf.gd/konica_minolta_c458_brochure.pdf
    • http://jaziwovapotulit.epizy.com/ganesh_atharvashirsha_audio_free.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_off0000eb3c.bin
f50df140613b6278082ea6ede5d5847007bfcb24c17358068a3d9af39fa59070		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 5368 bytes
font_01_sfnt_off0000fd84.bin
4e27a32e031128cd4894ee80765b6e44fe4b2f611bde4573f07b246c09203dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 10468 bytes

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