Malicious PDF — malware analysis report

Static analysis result for SHA-256 128875443786df9a…

MALICIOUS

PDF

76.4 KB Created: 2021-03-14 13:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 383968f49986b9388b368267cd6514b2 SHA-1: 202ff7ebe6d14e2c7294fbdd790471c127c014bc SHA-256: 128875443786df9a76405db4ecac4f816064afb05e9d9b407fb9b2a22fd4e779
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting, and a critical ClamAV detection indicating it is a phishing trojan. The ML classifier also strongly suggests maliciousness. The document body, though heavily obfuscated, contains references to wkhtmltopdf and Qt, suggesting it was generated by a tool, and the presence of embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/wix?keyword=types+of+vanilla+flavoring PDF link annotation
    • https://cdn.sqhk.co/teforoke/Rqjj7B7/lock_screen_ios_14.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/ibHmrjf/at_t_device_unlock_support.pdfIn PDF document text
    • http://uscreditcheck.info/susoni8axw4.pdfIn PDF document text
    • http://canonsburglake.com/97735592126dk7s8.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/3278647350.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/how_do_i_reset_my_roberts_dab_radio.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/c7WCgc6/bowakipurepogesozirunu.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/pokemon_strategy_guide_worth_it6p1d1.pdfIn PDF document text
    • http://shop50off.info/pwm_solar_charge_controller_installationn5c7n.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/living_cleansing_balm_tm.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/iKiiiii/79099933264.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/cucurbitaceae_family_plants.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/1fcffdfe-f4b3-4e97-89da-2c4509883546/millers_falls_1124_miter_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ef83ce-f4db-42f0-a6cc-1931887a92e8/81782450596.pdfIn PDF document text
    • http://nijarigu.onlinewebshop.net/cours_complet_sur_les_bascules.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/pefovuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c228ed94-92f2-45ad-9a10-e90b456a7919/quadratic_equation_worksheet_grade_9.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/13502818764.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/pokemon_go_leader_arlo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/how_to_bypass_lid_lock_on_admiral_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fff717e-b2b7-478d-aefa-cf9452d1dde7/how_long_does_it_take_sperm_to_reach_fallopian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f45756e2-3d29-4931-a477-0dce4c10a4ed/surah_yaseen_with_hindi_translation_mp3_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/sutulumabokufetu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 5180 bytes
SHA-256: 6811e52dee2406eebcb906363e6319b74ebdfa7dfaeec923915f1dbf6998ec6e
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10996 bytes
SHA-256: daa5234b5dc64369347f2fc2525e78b369cfceb7f11f0715c7d061aebbb504cf

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