Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed926cdac48dfb0b…

MALICIOUS

PDF

77.2 KB Created: 2021-02-21 06:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 741d06d2d6ca9c4553e8ed691373d7c7 SHA-1: 531b28f2b450be9ff38d003e09261d8069e1d90a SHA-256: ed926cdac48dfb0b78788572478ff2215a541c814967ed1e883c5f90d9d7782a
166 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=bontrager+300+battery+change PDF link annotation
    • http://fojozefamofu.22web.org/74666959780.pdfIn PDF document text
    • http://parkingtest.xyz/zezosikapupukotkjdg4.pdfIn PDF document text
    • http://uabiomanix.xyz/fifa_world_cup_songgme23.pdfIn PDF document text
    • http://difuwikikum.iblogger.org/java_installer_failed_windows_10.pdfIn PDF document text
    • http://makululi.iblogger.org/zosiwe.pdfIn PDF document text
    • http://menbp.online/what_if_netflix_trailer_deutschsu1tf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_6031499d71db0.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/samsung_galaxy_s4_mini_instruction_bookhgg3i.pdfIn PDF document text
    • http://vazutokidoxe.iblogger.org/hydraulic_accumulator_circuit.pdfIn PDF document text
    • http://ig-supportcenter.xyz/iron_masters_country_club_restaurantiu5r8.pdfIn PDF document text
    • http://psylath.com/84939206204jh40h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410731/normal_60051f530309e.pdfIn PDF document text
    • http://itwow.info/pokemon_r2_shinylocke_romlof46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxejoser.rf.gd/tugabefisupamatadixuj.pdfIn PDF document text
    • http://ladisopezaxak.epizy.com/unir_varios_en_uno_adobe_reader.pdfIn PDF document text
    • http://juxawewoguseku.epizy.com/funitakovoragizojinuva.pdfIn PDF document text
    • http://pewaxoxepizus.rf.gd/befururegowa.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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 5448 bytes
SHA-256: 11969d3e25f2d79f862ce7c8cceb08b1d0ade250c4fe30ca973865aa6b1f9ff0
font_01_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 11004 bytes
SHA-256: 5f4162515e88d97e54ae44668529af03e5ca5213f5a3df3fffe6e6caff72cba6