Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acde4269f8aff25…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 04:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bea01a231ab260a4f22b9d77f9e1f520 SHA-1: d2d2d20d4d6e1b9c475f47a2f0fc6b67bcda0385 SHA-256: 6acde4269f8aff251169840ad2d9e1170b704eef14e099fd5192d1bbc57c1adc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to free software, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=free+audio+editor+windows+10 In PDF document text
    • http://gekifek.scienceontheweb.net/oreilly_python_books.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/giujhyw/bafufuvuraxivuduwawuvux.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/namawalobewozujaxifafa.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/e8YhfaS/29139546841.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/ajTieif/bike_wallpaper_for_laptop_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fejumoraw/jgQjjBg/jedivopexewevizasapopexa.pdfIn PDF document text
    • http://damvglaz2.xyz/annie_script_downloadunpu3.pdfIn PDF document text
    • http://cocobuka3.xyz/graphic_organizers_for_writing_a_parbutyo.pdfIn PDF document text
    • http://goromeo.club/types_of_conversational_tonesd057k.pdfIn PDF document text
    • http://meetplafond.xyz/how_to_install_laserjet_m1212nf_mfpmhn0y.pdfIn PDF document text
    • http://bosuloridulumo.22web.org/warrior_cats_movie_director.pdfIn PDF document text
    • http://mynasert.online/what_tablets_can_run_windows_103gj9x.pdfIn PDF document text
    • https://cdn.sqhk.co/pulobegefuzi/ymgckjd/truck_trailer_hitch_for_sale.pdfIn PDF document text
    • http://mefuban.iblogger.org/what_courses_to_take_for_cyber_security.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/the_hunger_games_2012_full_movie_free_download.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/6fecd37e-beda-4e5a-885a-b0801e218d52/barnes_and_noble_roald_dahl_set.pdfIn PDF document text
    • http://wememone.rf.gd/banshee_season_1_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/zupejipasawufabexujunetig.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/19558578442.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/xadunabugigifuvokoro.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/93690465897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c53e5bc-82ec-4857-ba9c-692284709b94/xazutarafufenerapopejaxu.pdfIn PDF document text
    • http://tawegoju.rf.gd/papefuxopegar.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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 5028 bytes
SHA-256: f96806a43509abc082edc40cf1f74b6945087b00068408a332207de26731a092
font_01_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 10288 bytes
SHA-256: 02cfcb1e7fc6d1e6b8e0868e91991083964424d7fb7418ec42e482241380c4c3
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d