Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9988fd91c60609f…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 08:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 43ce644621551d2295619ad67f0a2512 SHA-1: 0440c522249d6f3d55308f2a9614f21b88dff279 SHA-256: e9988fd91c60609fbdf7f1129c9b66cefac368790383d4fd1682db7f14cef134
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to human resources management, aiming to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=administracion+de+recursos+humanos+pdf+17+edicion PDF link annotation
    • http://policyhelpcenter.com/67335906078sezzg.pdfIn PDF document text
    • http://winnerslm.space/express_vpn_android_full_versionidp46.pdfIn PDF document text
    • http://befigter.xyz/raxatixenukotedeledumh4ts.pdfIn PDF document text
    • https://cdn.sqhk.co/gidagolusi/jP9eEgd/toon_blast_game_cheats.pdfIn PDF document text
    • http://vanlit.ru/682796354774s2pf.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/igjipNy/41097612199.pdfIn PDF document text
    • http://update-win20.online/jobojejonurovubzc2nk.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/jeajhjj/81263443886.pdfIn PDF document text
    • http://mylevel.store/474927318945c2th.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cfd3b0-adfc-46c1-8b77-fd6b45e6c93e/programa_de_estudios_2011_tercer_grado_ciencias_naturales.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/tenixamovakiviritu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5434989e-fd6d-406b-9059-e7da10656f57/munchkin_cards_in_hand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f0cc99-7ce0-4cca-8f76-61a6d6b034e3/what_is_the_zip4_code_for_my_address.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/sosobawozoruzaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58245b9d-0fc7-4827-a7cb-4720d8e96e1a/22009743923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94f1254-c02d-4a60-b8d7-392998295803/vofikutujususujawikusex.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/good_night_sweet_dreams_image.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 5484 bytes
SHA-256: d8b9aea9df9058768727e333a9b9b154f669a3578cd4c25d1425ae7ba5b17c6b
font_01_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 11568 bytes
SHA-256: 1ffe086d26ceb7f7ca42f4ca969dbc714b0b49cfb7c8ec3e820fbf1b05be1693
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 16060 bytes
SHA-256: d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613

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