Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c729ff312f042e9…

MALICIOUS

PDF

75.0 KB Created: 2021-04-06 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e136633bd8f11b0292b02652300fba88 SHA-1: 23e6fa8c52b77fe88fc78cfaff9c341c1e440231 SHA-256: 9c729ff312f042e97e43c33f78a9f3adb7233ed705e06b87edd50744c1113780
126 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 phishing or trojan payload. It contains numerous links to external websites, with one prominent URL suggesting a lure related to file compression. The presence of embedded URLs and the overall structure point towards a phishing attempt designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=compress+pdf+file+size+to+200kb+online PDF link annotation
    • http://gavolav.mywebcommunity.org/voltage_transformer_testing_and_commissioning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366660/normal_5fdfdc2a53db8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_600c2002da406.pdfIn PDF document text
    • http://nazhivy.net/rikiluvw70nw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_600de300d5f5b.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/all_maths_formulas_for_ssc_exam.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/eVek9K0/photo_editor_app_for_pc_windows_7_download.pdfIn PDF document text
    • http://prodive.su/lowugigonuzuwumikvmpzz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_606b972d33089.pdfIn PDF document text
    • http://usesalon.xyz/88099056004qppge.pdfIn PDF document text
    • http://instapodarok.site/58378581568y7cw0.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/consecuencias_de_la_caida_del_muro_de_berlin.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/icAPIgd/barbecue_sauce_on_my.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_60224e6c8572d.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/eb5kDsd/bubble_tea_flavors_to_try.pdfIn PDF document text
    • http://mediaverifiedbadge.com/funanutoworedoditepiwutg15vn.pdfIn PDF document text
    • http://pezejij.mygamesonline.org/australian_national_anthem_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_0ed98ea1031b47e3a75d63ea7126b5bc.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_91fc07113e9a4d628e72815bd5482dd6.pdf?index=trueIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_532fdd366bff4eceb5706054b2a706da.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 5408 bytes
SHA-256: 3824cd7a867b9e7bc8a816f3361c3f0cebdd4dd8b3cf3f82d36cf3afa84d9cd7
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10536 bytes
SHA-256: 2d626b8ce0885d8002597d648528429b86fc432956f85c16b1baaab9da63bbe5

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