Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4acd842fe229eb…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 11:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5fb62151b5feadf3ea25ed778fe93313 SHA-1: b012d33c2284d31db7ab350f24f648e4e658b180 SHA-256: 3f4acd842fe229eb79fe284a408015660458b297a5ce28cff354c6f03f03426c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=equivalent+fractions+grade+5+pdf PDF link annotation
    • https://cdn.sqhk.co/pawekenu/ihi6jcL/farm_village_game_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/0KhaTje/photo_mixer_app_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/Sggqjii/1512386300.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/first_aid_2019_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/dmVfha2/jawa_adventure_300.pdfIn PDF document text
    • https://cdn.sqhk.co/rupomotiz/D2PVjeH/dasovirepari.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/Iicifx0/62494284136.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/what_are_the_goal_of_educational_psychology.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/iiPShcm/proxima_centauri_coordinates.pdfIn PDF document text
    • https://cdn.sqhk.co/sidigodoga/Mhi9QSz/pok_evolution_clicker_planet_idle_merge_games.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/dpxujhq/sort_stack_leetcode.pdfIn PDF document text
    • https://cdn.sqhk.co/bimerolu/hjhaiiD/jodimowutafukupubil.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/yard_machines_132cc_20-inch_push_gas_lawn_mower.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/deweto.pdfIn PDF document text
    • http://wuzubofetaxoger.iblogger.org/dictionary_attack_password_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gepuwuvezu.epizy.com/40315548815.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/harry_potter_mystery_quidditch_quiz_answers.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/characteristics_of_qualitative_research.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/arya_malayalam_movie_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/wevaxezapepamokatekusoke.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/asal_hzn_forml_nedir.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/piramalamumarawefubor.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_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5592 bytes
SHA-256: f6a5c130fc0031e376b051fc2153147f9682d007cf42dcc7dc146a41feb60fcc
font_01_sfnt_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 10860 bytes
SHA-256: e1cd0b06c70fb18e7409fa190853da4a5cc1fe9d78cb99a870c0fdc67760cbc5

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