Malicious PDF — malware analysis report

Static analysis result for SHA-256 a085bf2437a9374b…

MALICIOUS

PDF

76.2 KB Created: 2021-03-25 16:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e41c204f5ea4bbafee6cf20dacde7eef SHA-1: 6a81241688028e307afff832e0bfac7439b04d23 SHA-256: a085bf2437a9374b782aa2ab3043ecfd9856e4d49215d8304ff5c579e6899765
136 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and embedded URLs suggests the document is designed to redirect users to malicious sites or download further payloads. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with references to 'powershell_in_a_month_of_lunches_linux_and_macos_edition.pdf' and several URLs indicates a potential attempt to execute commands or download additional content, possibly via JavaScript embedded within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zajinet.ru/wix?keyword=grinch+pajamas+4t
    • http://kevifiregerufug.scienceontheweb.net/anamnesis_significado.pdf
    • http://beririka.scienceontheweb.net/gmat_official_guide_buy_online.pdf
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/kuxuwejon-famiva-rogesotawusake-levabizulukupuv.pdf
    • http://luziniwanemek.sportsontheweb.net/status_code_03-80-00.pdf
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/towido_tugikibotis_wadizu.pdf
    • https://cdn.sqhk.co/jovowosifo/ieNBGig/shoot_the_duck_roller_skating_gif.pdf
    • https://cdn.sqhk.co/xenumobavun/dgUhgB1/63722753604.pdf
    • http://tuwimig.scienceontheweb.net/marshall_haze_40_specifications.pdf
    • https://jitifawe.weebly.com/uploads/1/3/5/3/135327084/xedusagiwevana-negipelegipunus-viwodopekoji-gowasofopuzulu.pdf
    • https://bujopulima.weebly.com/uploads/1/3/3/9/133997272/noliru_gikazodo_relekona_rufub.pdf
    • https://cdn.sqhk.co/zasemewiti/CihI1jb/defence_job_apply_2019.pdf
    • https://cdn.sqhk.co/soxuvezosapa/cic3mQk/30331080186.pdf
    • https://cdn.sqhk.co/ragojagef/8HHhghi/roller_coaster_arcade_bundle.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a4a0a383-2510-4293-a876-2fc0ebfb1d7e/91184124175.pdf
    • http://pujumek.myartsonline.com/ancient_world_history_books.pdf
    • https://uploads.strikinglycdn.com/files/0183d66c-eceb-41b5-bc06-d34a0dcb2f30/learn_powershell_in_a_month_of_lunches_linux_and_macos_edition.pdf
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_9dd8b236a69c415497179c1139af824e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bdeae40e-2638-42a8-a2af-174f13790f36/way_of_the_superior_man_quotes.pdf
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_f0f7db3e19d94e5a832091554029e6b5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a6144e9-4e0c-47fe-ab78-557f90669389/life_application_study_bible_nkjv_free_download.pdf
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_8531b10c181f48bbb69c5b4ee97cc897.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eac316ac-bdc0-4521-bfee-c809dc9ee0dc/how_to_renew_mississippi_drivers_license.pdf
    • https://uploads.strikinglycdn.com/files/95d0fd8c-0e49-4fab-94dd-909cdcad7dc6/neuropsychological_assessment_adhd.pdf
    • https://uploads.strikinglycdn.com/files/4e407253-b72a-4a14-96e8-2dfe66ec7824/patch_league_of_legends_tft.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d891.bin
af40687f29064e35aa2c627d76f46c03b14a6b1d5448922d933990467a8b96ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 5336 bytes
font_01_sfnt_off0000ea99.bin
f9a07f30c045ce3f2b4ffddc708c13c5cf720edeb9bfc9ecf28a2e48990593c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10368 bytes
font_02_sfnt_off00010dfe.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 16204 bytes

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