Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9c44a5e1be1c94…

MALICIOUS

PDF

81.2 KB Created: 2021-03-08 23:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a7156d269b72aadf5f8c50d3debd5fba SHA-1: 4ba31dead8c845224eb05077bc30657d93111a0d SHA-256: 6b9c44a5e1be1c94e5fb8b67471347fcbde0ba39c9e1b4e0386a08d129dcbaf5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it might be a crafted PDF rather than a legitimate document.

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://dugedepap.ru/award?keyword=merge+pdf+on+mac+free PDF link annotation
    • https://cdn.sqhk.co/borefigux/edBE4gj/fist_of_the_north_star_movie_vs_anime.pdfIn PDF document text
    • http://pavaverijakat.iblogger.org/teatv_apk_for_roku.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/babafukakiru.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/hhigf7H/game_of_gods_apk.pdfIn PDF document text
    • http://vuvefezod.iblogger.org/book_series_guided_reading_level_l.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/son_of_god_translated_into_hebrew.pdfIn PDF document text
    • http://letaraluzim.scienceontheweb.net/adobe_reader_free_download_software_for_windows_7.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/ethical_dilemma_examples_and_solutions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ginowane.onlinewebshop.net/analytic_geometry_worksheet.pdfIn PDF document text
    • http://dadagax.epizy.com/xemipivavazazid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f020a23a-2dca-42d1-b0e5-960d9276d93a/eat_what_you_watch.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/acte_vente_voiture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b678d21-95a4-447f-8d96-39f3dbc45529/vaxasixafojazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffae0bc-2304-46f5-9f53-eb7d792b362d/17868102893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d14610-bfb5-4084-9cb5-56ca1415e92c/el_arte_de_amar_erich_fromm_resumen_yahoo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a3ea9c-5bea-46f7-b945-ef023aeb2ba2/homelite_gas_weed_eater_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/naruto_blazing_ninja_road_20_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/684328a1-950b-41f8-b8e3-aefa09d5dce8/gimosurumalodimumekunov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6d5b0c5-4804-468e-aa3e-a43ea6d60303/kozezazojeletoxekapudozu.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/73774528781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf63ee98-ea94-449b-a30e-16dd126133c4/how_to_reset_zyxel_powerline_adapter.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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 5272 bytes
SHA-256: adcbc8f602ec1b49099e9a6e7332353a0a3092aad410f84ea13ea1fae19dcc66
font_01_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 10228 bytes
SHA-256: e38d597b3afce0dd5d6cfc1d9d5c68e80c6c92b74dee60a52784255bab2c4fdc
font_02_sfnt_off000121dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DD 16388 bytes
SHA-256: 4189bb5d82d37c3b06c761c00ca3b3c8a7a7312639514cd6a20481e76712d457