Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e558b394c25ac6b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-25 07:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 58c5ab17df189c9a3a2b5f70ca50a943 SHA-1: df23693e80c1f0d73c60714a242878ada98b9e06 SHA-256: 8e558b394c25ac6ba969110e6f6be14082386586b61a8e2cb1f919f0354a6433
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, with the primary URL pointing to a site that appears to be a lure for educational materials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=filipino+reading+comprehension+worksheets+for+grade+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5fceebdfa8617.pdfIn PDF document text
    • https://wowujagudafu.weebly.com/uploads/1/3/4/7/134751604/2682384.pdfIn PDF document text
    • https://kavixonew.weebly.com/uploads/1/3/4/5/134592395/lolepimizisijox-nuxuwuxuv-gopuvimis.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/9778696.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/vuxavewis.pdfIn PDF document text
    • https://puxivulikuvudet.weebly.com/uploads/1/3/4/6/134663564/nulerepewuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_602d204a0ec6b.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/wufexo_fonejakita_wepig.pdfIn PDF document text
    • http://benaletuzulug.sportsontheweb.net/adobe_scan_scanner_for_pc.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/xurox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465701/normal_602a31c3ac14f.pdfIn PDF document text
    • https://sajefabavasa.weebly.com/uploads/1/3/2/7/132710755/malekawifizo.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/81019878875.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/xekililobeduxetosemotijon.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/xirazovixugorutor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_81f30e4294eb4a0e8469207568b28a15.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_dc00a1ac492d4924b12d15f4431aae75.pdf?index=trueIn PDF document text
    • http://beliraguw.onlinewebshop.net/pitozunerarisijivazif.pdfIn PDF document text
    • https://63150c49-9e7f-4923-bc7a-1e4049050ce6.filesusr.com/ugd/cba449_2ccaa4ce28154875a6eab2ddfc7cb57c.pdf?index=trueIn PDF document text
    • http://niwurekatexo.atwebpages.com/interview_questions_for_special_needs_teaching_assistant.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_88add3c8d9e744ef92bf0b11bc77ec9d.pdf?index=trueIn 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_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 5872 bytes
SHA-256: 815f80c15ef39960d0b7661ae408d0421a9727b1fe4f173d5b18da896329a722
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 10828 bytes
SHA-256: 08ce84633b10cd406cb82dba35c8452604cbe1c3b2378466b2a9dce544f9228f