Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8e1165bac50c6f…

MALICIOUS

PDF

73.8 KB Created: 2021-03-07 23:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6f4fa4fb6b1ee540468dc2c34790c0d0 SHA-1: 6571fb6d2373157c4859218f7a93b2633b5e1750 SHA-256: 0d8e1165bac50c6f705934cf29f162e8e71cf7015d8010e312934264df779ac5
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 0.9999

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://jacksth.ru/aws?utm_term=samsung+galaxy+tab+4+7.0+charger PDF link annotation
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/zurumajajow.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/hghejgS/52684961766.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/migaj.pdfIn PDF document text
    • http://fonomujolatuv.22web.org/electric_tankless_water_heater_installation_guide.pdfIn PDF document text
    • http://goropefixujifep.22web.org/gopinikejinawakori.pdfIn PDF document text
    • http://wotodusasesode.iblogger.org/price_triumph_bonneville_t100.pdfIn PDF document text
    • http://mavavuvew.22web.org/what_does_the_song_yankee_doodle_dandy_really_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/FQiihdQ/41556412125.pdfIn PDF document text
    • https://tiseworadew.weebly.com/uploads/1/3/5/3/135317060/6533918.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/fgehiyE/exoskeleton_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/xivumatozo/PihHRge/dabupop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rozevilamires.rf.gd/dress_up_worksheets_for_preschoolers.pdfIn PDF document text
    • http://gegukisakewomo.rf.gd/rulozusijufexitafukev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8f5f4c-92ea-4062-96f1-e422d5a0fc63/is_wealth_tax_good_or_bad.pdfIn PDF document text
    • http://zokidogonaz.rf.gd/xerinegemonukelivura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432cd0e4-9d1f-4d8c-8f04-9c5ea15925e2/jabigu.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/xopesosavu.pdfIn PDF document text
    • http://josuguremim.epizy.com/60399220935.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_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 5968 bytes
SHA-256: 9993b4d99ff787ddb4782cdf70c6bdf24b3a3508440c145790440f059b073def
font_01_sfnt_off0000f47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 11104 bytes
SHA-256: 1e35b30e1d48d19f76550b407d22cd9998d71e6bb1b6e171751b9296a8cc11b0