Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c93551f3df7964…

MALICIOUS

PDF

78.6 KB Created: 2021-03-15 00:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b8a8ff18de5915b61e112d2a619da23f SHA-1: 3970335618f3df12a2a44def5a4a72e2729c0f6b SHA-256: a4c93551f3df796420a6e7a29657e97b8c42243995372b0cbd02bd26ea51de11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://botokaw.ru/strik?utm_term=honeywell+rth221b1021%252Fe1+thermostat+user+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476566/normal_6028f8b738733.pdfIn PDF document text
    • http://paxivevazuf.iblogger.org/java_8_162_archive.pdfIn PDF document text
    • http://xozonline.ru/98296386994domiv.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/3jbhfOB/wololo_meaning_aoe.pdfIn PDF document text
    • http://mon-fortuneo.best/geekbench_4_ios1gan6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530429/normal_5fd0dd363c67b.pdfIn PDF document text
    • http://mif-smeh.space/how_to_program_my_hampton_bay_remotecqpnr.pdfIn PDF document text
    • http://kino-vezde.ru/49496446518d1iq7.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/hdpEjia/43323011741.pdfIn PDF document text
    • http://rusakova.space/toyota_camry_trd_2021_v6b1war.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/VjhFijX/stronghold_kingdoms_castle_sim_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bufudoraxala/Rje6Ajg/bugsy_malone_rapper_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/2hdjije/90799644098.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/929fa191-0336-4bf1-9d63-1fe4f1c1da12/can_i_get_procreate_on_ipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f85618-7c4e-4e6e-a368-73968342d5f7/the_secret_rhonda_byrne_book_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c23a1b-0094-4b19-bc83-cb8a0928dff8/32588133578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede147b1-837f-4545-b0f9-411f2e13527e/93006468669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4605dc36-ce25-4614-962b-f393eaf825f4/can_google_voice_numbers_be_traced.pdfIn PDF document text
    • http://lojupodinitaxug.epizy.com/standard_deviation_at_work_mathbits_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c446734-3111-4742-acdd-97e35af76042/how_to_use_easy_home_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1428db12-60c9-4b05-a0d6-addce42c1f27/what_is_the_theme_of_the_story_all_american_slurp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91863f9b-ba79-4837-89c0-d40394d8dc41/rex_c100_pid_controller.pdfIn PDF document text
    • http://folujas.epizy.com/kifopanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96ae086-6590-42a1-97b5-df4abd1f37fc/74591227706.pdfIn PDF document text
    • http://xavujoz.rf.gd/bluebeard_short_story.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5580 bytes
SHA-256: 1ab0d23eecf3106014b2a60a484dada338a12c1ea19dccbd7bc7bc128cfe2a6c
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10588 bytes
SHA-256: 6ccb4877d3a007bde3ad2a78ed8353d224e2966017d5885ee4da25e5601103e1