Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c78f0f3373f7ec…

MALICIOUS

PDF

77.8 KB Created: 2021-01-24 12:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a5ecfc7a3dbd0be6fb8de5f07a4f60d5 SHA-1: 242cb400c269e315630a6c8bdef0b8b8f8af6f3b SHA-256: 33c78f0f3373f7ec47add2827e98276cfe64a70a1e834e68277ccba431b1ac57
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 0.9996

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://leonvi.ru/aws?utm_term=etv+guide+now PDF link annotation
    • http://xapizokawe.iblogger.org/wiviwavusa.pdfIn PDF document text
    • http://eroganoficial.site/videos_like_de_amor_cortosvbh4s.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/togajem.pdfIn PDF document text
    • http://cookwellbakewell.com/nirejonozugijoxuneva9gfqc.pdfIn PDF document text
    • https://jaluzirilunotu.weebly.com/uploads/1/3/2/6/132681851/rapafewat.pdfIn PDF document text
    • http://lnstagramverifycentre.com/classroom_management_strategies_bookzx3xc.pdfIn PDF document text
    • http://wekeb.space/drift_trike_for_sale_australianai38.pdfIn PDF document text
    • http://vizionsmc.net/vitamin_d3_vs_d12gca7j.pdfIn PDF document text
    • http://copyrightproblem.com/pixatisil2ftch.pdfIn PDF document text
    • http://santaparker.store/cyclebar_membership_discountyqyth.pdfIn PDF document text
    • http://goloszauniver.fun/xemepevigodadinolapaohpfj.pdfIn PDF document text
    • http://navaram.online/torn_labrum_hip_pain_reliefxbnyz.pdfIn PDF document text
    • http://panivupod.22web.org/zovelozuvo.pdfIn PDF document text
    • http://bionatur.space/league_of_lords_battle_of_demigodsfztec.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/2013_tacoma_x_runner_for_salee75el.pdfIn PDF document text
    • http://verification-help.com/89491150524gvuct.pdfIn PDF document text
    • https://tutofegabosig.weebly.com/uploads/1/3/4/7/134725810/gokovenolodizef.pdfIn PDF document text
    • http://znatural.space/xeledoxuwomum0nlk.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/avast_for_windows_7_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujusojup.epizy.com/92425524338.pdfIn PDF document text
    • http://peworesafasar.epizy.com/bangladesh_cricket_picture.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_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 4588 bytes
SHA-256: 52a68bc446be5c214775561c101e03e354d981294a75562fca1bd87d0ad3750b
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10864 bytes
SHA-256: 138934c90a19b67c4c8e790fe9dc59e9486522a62fca398ec070715804969c21