Malicious PDF — malware analysis report

Static analysis result for SHA-256 2826b15184e8d8a2…

MALICIOUS

PDF

170.5 KB Created: 2021-04-06 20:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 45df24f86f73c1ba6b3cbd2f6130f8b6 SHA-1: 297e5a2933073d1c7d14a4bb5a703cbaa7e0e70b SHA-256: 2826b15184e8d8a2cf91be4bd61571a5664138de38b24111512f474c0b4cf981
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'isentropic process pdf' and uses wkhtmltopdf, indicating it's likely a crafted document. The presence of multiple unknown reputation URLs points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://zajinet.ru/award?keyword=isentropic+process+pdf PDF link annotation
    • http://malanefire.sportsontheweb.net/nidororuzekitagidogoxovel.pdfIn PDF document text
    • http://trokot-newshop.online/pizon310x4.pdfIn PDF document text
    • http://it50save.info/aomais_sport_ii_manualu0f3r.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/jhibjdY/2015_fiat_500_pictures.pdfIn PDF document text
    • http://deutschebank-meine.com/jixojatoxodozamuyk2.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/48571879207.pdfIn PDF document text
    • http://edaeda.moscow/reasons_to_stay_alive_book_free_downloadq4xrc.pdfIn PDF document text
    • http://hookup153.space/tlc_and_column_chromatography_lab_reportpf2rh.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/0VMc37y/88092631091.pdfIn PDF document text
    • http://lulizukudomiz.scienceontheweb.net/gusotalepob.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/idhgTPf/31317367179.pdfIn PDF document text
    • https://cdn.sqhk.co/poturofivat/jdgiUBJ/13897778455.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
    • https://s3.amazonaws.com/suxugipipolazog/blur_background_photo_editor_app_android.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_35a6b83662104b4f9ddccff957a034f8.pdf?index=trueIn PDF document text
    • http://jujobope.atwebpages.com/82898275938.pdfIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_c446a76dae6f4c41900962c23ea25dd8.pdf?index=trueIn PDF document text
    • http://pozidijapepore.atwebpages.com/how_to_train_your_dragon_series_books_in_order.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_de8b6370b24541988ef7e0f62246f998.pdf?index=trueIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_2d7b2e0e048e4261bc593f66b800d4ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fofeguj/chimani_pakhar_marathi_movie_ringtone.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 114000 bytes
SHA-256: ad9028bcacd4965bf9cd5d735dbf0b3974232c8f9d5196460c8f77ef991d044b
font_01_sfnt_off000240d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x240D5 4632 bytes
SHA-256: ce7485a7441baee976b2e544185f8f6dddf375ca12bd4025599c60f8d6b6727a
font_02_sfnt_off00025097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25097 11044 bytes
SHA-256: 61028a2e17499d0b8b4a4e77bfdc965e4b947efe2cfc7343a2ab590bd79e0b99
font_03_sfnt_off0002765a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2765A 16076 bytes
SHA-256: ca544181fda43efad2f5637379cc94e84a87fe44a2ab434df0e1a6c4e92f4d9b
font_04_sfnt_off00028b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28B07 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3