Malicious PDF — malware analysis report

Static analysis result for SHA-256 af39d398d61189ae…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 11:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e7c8f5b0bbd5e32b3d38fb88fe6133 SHA-1: ddf2655c8a4f93dd32e4ae19d75dbd81fd69d408 SHA-256: af39d398d61189ae72edf0880bab972791df513983516a9a6bd33f61a2bb3ea6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a significant number of external links, suggesting a link farm designed to redirect users to other potentially harmful content. The primary malicious URL identified is https://dafemum.ru/123?utm_term=critical+ops+hack+apk+android+1, which appears to be part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=critical+ops+hack+apk+android+1
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/3812389.pdf
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/mulesedek.pdf
    • http://mopexaxurip.getenjoyment.net/diablo_3_monk_speed_build_season_21.pdf
    • http://suzamakulamuj.mypressonline.com/zebofetukarakoripoxevoda.pdf
    • http://nigodofifulo.scienceontheweb.net/59376476067.pdf
    • http://sufawevugut.mywebcommunity.org/tourism_marketing_manager_salary_in_south_africa.pdf
    • http://wivevadevenumet.mywebcommunity.org/arrl_antenna_book_download.pdf
    • http://lovupijuti.getenjoyment.net/how_to_contact_planet_fitness_corporate.pdf
    • http://fadewujetenuve.mywebcommunity.org/jivorulapeledixipag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_8e8a6dab918247ecbfd97b2bd10259e9.pdf?index=true
    • http://sinusisokopex.atwebpages.com/pegekaxag.pdf
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_34e70b4dd149424abcf10231b76a60c6.pdf?index=true
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_552996f240884546b88856d2fcc09dd5.pdf?index=true
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_f7943a0a16454c9c9661dba8e2eb229e.pdf?index=true
    • http://muvemaxadal.onlinewebshop.net/agro_ecological_zones_in_sri_lanka.pdf
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_af0c20416e2e4bfab5e9bc5752957bab.pdf?index=true
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_a0107332fad44211bf8ba3ee02756ad6.pdf?index=true
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_096228f316ea4d3aa7681fc101c1461c.pdf?index=true
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_72a933777ce24e04bef3790274c528e2.pdf?index=true
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_6e3cbba755c64203a8f4abf04d4e18a2.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_cfcc8e9fe83440c09be4426362a5f9a4.pdf?index=true
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_db111b1efe374456ab61eb34bcc050a7.pdf?index=true
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_e862de2c2f7c49a79b5aa39b3761e866.pdf?index=true
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_3c3391486b2e406baf4038662c9147a4.pdf?index=true
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_c06c456bf36344ebbd6cb122fa4205de.pdf?index=true
    • http://neloralo.myartsonline.com/25934275499.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_off0000ef56.bin
800bc9c088cb86311573fa2df7e04cfa37ff3d6c7c4a3328088315f6d916c294		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 5180 bytes
font_01_sfnt_off000100e8.bin
df7fe2a6a588f89aa00b3a4bcb3f3ce97cefd24bc301f79b90a1e3bb7221f5b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 10932 bytes

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