Malicious PDF — malware analysis report

Static analysis result for SHA-256 8108751a842ace80…

MALICIOUS

PDF

79.2 KB Created: 2021-02-07 11:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3482cc59a537bd351122cc3a434a218 SHA-1: 41bba97f1f8a4014f102da42d3d6800128af0d1b SHA-256: 8108751a842ace80bd7f961a7c0ccdf14f2a71fc6fa87791e5516e2d2e270d53
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The primary attack pattern involves luring users to external resources, likely for phishing or malware distribution, consistent with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/aws?utm_term=vanguard+zero+demo PDF link annotation
    • https://cdn.sqhk.co/vorebilifi/hbZhaR4/download_game_real_car_parking_multiplayer_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/jig3Vgc/cheapest_drum_set_price.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/exercise_posters_freex5gyn.pdfIn PDF document text
    • http://newser.site/california_motorcycle_handbook608ty.pdfIn PDF document text
    • https://cdn.sqhk.co/sutadejuna/X0PDgcf/vawofipajubetawabomavaga.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/jhjjhoD/nuluvagikuwuvev.pdfIn PDF document text
    • http://nosinoski.shop/ati_catalyst_control_center_windows_8yn5wm.pdfIn PDF document text
    • http://itsamorem.com/sodemeworosowogeselx4ft6.pdfIn PDF document text
    • http://frasqen.online/long_acrylic_nails_coffin_shapet2pbl.pdfIn PDF document text
    • http://praktika-ingenieur.com/xekuxitoxetiwekuxx5gt.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/zqoYjez/most_comfortable_modern_sleeper_sofa.pdfIn PDF document text
    • http://vorgazme.com/xaxobedugj7tu.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/zRjdgfC/zombie_defense_merge_td_games_offline_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/business_and_management_course_companion_oxford.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/altistart_48_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/nidezuwatusevetesevo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B3 5664 bytes
SHA-256: 34c4f938c0cf32549d88e9b2bad1b2b9f6295ca9b1198dba6d752c818cac25e2
font_01_sfnt_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 4952 bytes
SHA-256: c57ba3784deb7eb55c94db7e5a944ed9f0b394235a58db4121bfad48d3b41498
font_02_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 9888 bytes
SHA-256: 17d7c3e82e094ba1f94f3e594c80949591301b281cdbcd5b0ffd80b09a1d7d7b
font_03_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 16248 bytes
SHA-256: 9e020c854edd9d16e76d4d276d806d6ad9537766fc0f49e31c6b0dee74960295

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