Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c4ef8b2ffe13c3…

MALICIOUS

PDF

89.5 KB Created: 2021-02-17 02:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7ddd45cd40a16f73f6d0c66322ed4810 SHA-1: 30e618c8b2a2dfe5ca6d6b0a4abfaef22804e60d SHA-256: 64c4ef8b2ffe13c3c75f6e37f44c730a3462f9d0f3f76ed7a2c32392004f6368
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on a URL related to fitness queries. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous PDF files, suggesting a malicious intent to distribute content or redirect users. ClamAV detection and ML classification strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=best+workout+to+do+after+chest+day PDF link annotation
    • http://nonretloli.site/barbados_immigration_department_passport_formsibus7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448103/normal_600251eda4365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471971/normal_5febe89713130.pdfIn PDF document text
    • http://wildber.store/5487274909018vzk.pdfIn PDF document text
    • http://moresukko.ru/toyota_auris_2016_radio_manualwfisw.pdfIn PDF document text
    • http://getcreditcheck.info/dungeons_and_dragons_5ed_character_sheetcrufx.pdfIn PDF document text
    • http://verifedform.com/67574010008uvodk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_6021bb1a1929e.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/ableton_free_for_maczfjif.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/cDBdhfT/snowboard_master_3d_mod_apk_unlimited_money_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_601740d914b06.pdfIn PDF document text
    • http://reduslimitalia.site/b._com_part_1_result_2020_karachi_universityzb6bm.pdfIn PDF document text
    • http://dugules.iblogger.org/newasefij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://voxinuxo.epizy.com/32038401485.pdfIn PDF document text
    • http://maxegore.epizy.com/ableton_free_for_windows_vista.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/arduino_bluetooth_code_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/autumn_leaves_easy_piano_sheet_music.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011a37.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A37 26804 bytes
SHA-256: 56c460262cc154e797eb44797c88d778064023d87297ab8bb16b2129e75ab8f5
font_00_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 5112 bytes
SHA-256: 29e2cc69469fe58fce20a1aa29432fd6adc02fa14c0ac66f0ed91593a5418b25
font_01_sfnt_off0000f6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AF 10280 bytes
SHA-256: 7ab9c83835156c4e56bc8bb1c69969508c84ace3ea0e251e6689a12d5b0bcf87
font_03_sfnt_off00014a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A29 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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