Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a36759cd0755584…

MALICIOUS

PDF

74.0 KB Created: 2021-03-21 04:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 863c813095515bc432156fbd8db154a4 SHA-1: d939d771ddccaf400904bd3307c59f0bb2d9bac0 SHA-256: 4a36759cd0755584303327f31a55cff1354567f072d7548524f75f5356de6c75
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 0.9998

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://soxebez.ru/strik?utm_term=how+to+treat+the+phonological+process+of+stopping PDF link annotation
    • https://jokazetesolibut.weebly.com/uploads/1/3/5/3/135314514/69902.pdfIn PDF document text
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/6d3622.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/6206759eb4b.pdfIn PDF document text
    • http://ins.expert/galileo_galilei_discovery_telescopec4hp6.pdfIn PDF document text
    • http://m-ryanaf.site/countif_between_dates_google_sheetsktzw0.pdfIn PDF document text
    • http://uscarins.info/minn_kota_ulterra_112_60_for_sale20irc.pdfIn PDF document text
    • http://qwert-ita.fun/eye_of_the_beholder_definelh2zw.pdfIn PDF document text
    • http://jadebey-x.com/how_much_does_it_cost_to_replace_a_samsung_galaxy_tab_3_screen02z0l.pdfIn PDF document text
    • http://astropsychology.website/77955174221n7i74.pdfIn PDF document text
    • http://xigosilefonaboj.iblogger.org/ipcc_ocean_and_cryosphere_report_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tidomag.epizy.com/lonestar_amazed_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/pegidor.pdfIn PDF document text
    • http://dopelatov.epizy.com/21930822423.pdfIn PDF document text
    • http://kinuvafarugabob.rf.gd/59049997360.pdfIn PDF document text
    • http://tizelimanux.rf.gd/what_is_a_2007_chevy_impala_worth.pdfIn PDF document text
    • http://fukasutatota.rf.gd/sujuwifeguviliditaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/fill_out_ei_report.pdfIn PDF document text
    • http://xixomopez.epizy.com/baldurs_gate_2_switch_cheats.pdfIn PDF document text
    • http://xetagilijuf.epizy.com/garmin_62st_software_update.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 5332 bytes
SHA-256: 3a621d59d1245e45c33ad7a32ac884d8379b31656f7bb488af65917669aa4779
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 10388 bytes
SHA-256: 6bf728d4590e5308368553a8be921e3457ac51d1aaf7f65a89aadd711d12c528