Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d986b07a674e974…

MALICIOUS

PDF

83.9 KB Created: 2021-04-04 05:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9455370df6d6fa2fea41cd62c8cff0f8 SHA-1: 239f1ff72cfc81c4a2b1634cd183fc9b88d18401 SHA-256: 3d986b07a674e974e9739290f8aa42dadfcc9659f6864dedb9f26223dbb12d7a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=rassembler+plusieurs+fichiers+pdf+en+1+seul PDF link annotation
    • https://cdn.sqhk.co/tavazuvu/whdaDjf/chris_young_song_drowning_meaning.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/95350338814.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/ggrvhbV/next_business_tycoon.pdfIn PDF document text
    • http://gratoraama.website/gospel_song_lyrics_with_guitar_chordsoo3q0.pdfIn PDF document text
    • http://fb-copyright-help-from.com/rebukuraxopewabevavoxavi7fo98.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/66225364574.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/vupanemevezagiwetusakopuw.pdfIn PDF document text
    • http://masterpowerpoint.com/multiplayer_story_mode_games_xbox_onejvqgv.pdfIn PDF document text
    • http://gerda-msk.ru/what_are_entry_level_engineering_jobsced82.pdfIn PDF document text
    • http://good-production18.site/86169415077nxzkb.pdfIn PDF document text
    • https://cdn.sqhk.co/novitovikor/gihdqhi/air_france_flight_booking_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/X0qSk2G/zixolumoluj.pdfIn PDF document text
    • http://ferabugajefelam.mypressonline.com/16225542569.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/sqifiC7/rizotusulekegonomejer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/how_to_play_old_game_of_life.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/boot_camp_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/why_is_my_duracell_battery_charger_blinking_red.pdfIn PDF document text
    • https://81d89a68-18ac-4cf1-ad00-ddd5d2f7da41.filesusr.com/ugd/ed58ef_7fe68a2fe88645a19bb3c627a3011089.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/neil_gaiman_american_gods_season_3.pdfIn PDF document text
    • http://polilofu.onlinewebshop.net/bu_jhansi_exam_scheme_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/libro_de_colorear_dinosaurios.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/95086510692.pdfIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_a01d03f668f04968961acf86772f1633.pdf?index=trueIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_457da9a066fb4172a222129cfd59817d.pdf?index=trueIn 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_off00010668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10668 5596 bytes
SHA-256: 986b1ba76d2ec832e6ec8105506e22f1ae2efcfe8f9c717f1891f322ced33b31
font_01_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 12296 bytes
SHA-256: b49e97b932d0a05051ca31a9d330173a89b0d0d76249d5c04d48fc83871fc1de