Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ae5ec959dfb3df…

MALICIOUS

PDF

80.7 KB Created: 2021-04-06 08:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a465d3c191687ddf213df050730bd02 SHA-1: a8951b6c1aa13d288b3d29e02d0821d9e670ba4b SHA-256: 25ae5ec959dfb3df3159c641d35c3f594c43ce06a5e1f96137edf61f5cfa007f
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, with a high ML classifier score and ClamAV detection indicating malicious intent. One prominent URL, 'https://botokaw.ru/123?utm_term=read+theory+answers+grade+6+wild', is flagged as suspicious. The PDF's structure and content suggest it functions as a link farm, likely intended to direct users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/123?utm_term=read+theory+answers+grade+6+wild
    • https://xakunikuf.weebly.com/uploads/1/3/4/4/134478205/tuborajanovulo.pdf
    • http://pigokakiw.iblogger.org/rutowabo.pdf
    • http://wokanetavim.iblogger.org/93145361477.pdf
    • http://kogiwonewaveg.iblogger.org/24056778242.pdf
    • https://sasikeruxet.weebly.com/uploads/1/3/4/8/134851076/981499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5be06f42-fbf6-4bff-be6e-43c0653d7850/94736874644.pdf
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_a3a97a48d973464394484889994e95d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fd2853c4-fef7-4f31-b488-f59de7689283/gegewikexezutaxaruzogot.pdf
    • http://xawezovixewija.epizy.com/vimujujimisel.pdf
    • http://zegudonokor.epizy.com/citation_report_web_of_science_core_collection.pdf
    • https://s3.amazonaws.com/silubebebefuju/python_3_regex_cheat_sheet.pdf
    • https://uploads.strikinglycdn.com/files/8cfebd1c-e9c3-4605-be08-0a46f73ac072/39157887224.pdf
    • https://uploads.strikinglycdn.com/files/3a35e4d7-0e94-44cd-8a95-2867e48c3cd7/construct_2_full_version_free.pdf
    • http://vikapedis.rf.gd/general_information_about_computer.pdf
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_fe790dd00fb24b19878038c229ec1927.pdf?index=true
    • https://s3.amazonaws.com/medaliwifufugel/wahl_lithium_ion_trimmer_parts.pdf
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_02b19191b4f04decb2d6b694626e1cc0.pdf?index=true
    • https://s3.amazonaws.com/sinamozagemoger/85618635781.pdf
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_7de1d12d3af54d44bf3933ff9381aff1.pdf?index=true
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_8753e892e43249adafa218fe25a0ee4a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38a433cf-8da9-4bff-9b09-86e83c0c9a00/gnostic_texts_nag_hammadi.pdf
    • http://kavigadakubowaw.epizy.com/what_is_ponyboys_theme_for_english_class.pdf
    • http://rivobuzuxi.epizy.com/ancient_greek_etymological_dictionary.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_off0000fefe.bin
82bc0a37e0e7ea900b82e1cc77444bdb5cc2177337d82fa730f10bbd9e81d16c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 5444 bytes
font_01_sfnt_off00011199.bin
e971039d48adc4485d8c822a22b7de290e78db9019082b8b6efc664e9fee66fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 10604 bytes

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