Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f26d3e1350cb18…

MALICIOUS

PDF

82.5 KB Created: 2021-04-06 10:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d4fea6e53a0eec418a10ce2ca5d4732e SHA-1: 81e437badc967c650302bca8db80cd30ac5fa0e1 SHA-256: f5f26d3e1350cb18e8224282316f0e354cedb764c6a78a2dd2569e81d92d94e1
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-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://midufefew.ru/award?keyword=barron+s+gre+800+word+list+pdf PDF link annotation
    • https://cdn.sqhk.co/tekuligote/hgINiag/musica_italiana_bruno_ferrara_mp3.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/Sjdbic1/9444879707.pdfIn PDF document text
    • https://zuramuvo.weebly.com/uploads/1/3/4/4/134480672/bogebesobevakib.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafepel/FMggghC/modern_warfare_warzone_server_lag.pdfIn PDF document text
    • https://dowadumusisek.weebly.com/uploads/1/3/4/5/134521262/venirivixi_veruputirev.pdfIn PDF document text
    • https://lanudoda.weebly.com/uploads/1/3/2/3/132303217/wubekosipod_vifonudereju_viguxigawevi_dojulit.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/2020_december_calendar_printable.pdfIn PDF document text
    • https://maposege.weebly.com/uploads/1/3/1/3/131378999/7893160.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/QwjhQjd/zepulonamosetaj.pdfIn PDF document text
    • http://dukipor.iblogger.org/jodoka.pdfIn PDF document text
    • http://wotegop.22web.org/apostila_fiscal_de_obras_e_meio_ambiente.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagazirixul.rf.gd/mams_mall_job_application_form.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_63f0cbdefbf2475f9fb65521e279f2c0.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_6d2155c5832645ebbf0b038da264072d.pdf?index=trueIn PDF document text
    • http://pozaberu.rf.gd/91423330432.pdfIn PDF document text
    • http://xafafomuripag.epizy.com/77318545396.pdfIn PDF document text
    • http://domebiwek.myartsonline.com/zokaropiri.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/how_long_is_pge_power_outage_going_to_last.pdfIn PDF document text
    • http://bidexegope.epizy.com/kojigowu.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_5a5e33ef09844a2ab6eac797f55fcfc7.pdf?index=trueIn PDF document text
    • http://bujijawuta.atwebpages.com/bradykardia_leczenie.pdfIn PDF document text
    • http://tomenederixi.epizy.com/mabajexufufokanumasoje.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 5684 bytes
SHA-256: 307298aec970bc1f10027b0a98f341291515d6ad768ae6bca222d061bc55de36
font_01_sfnt_off00011ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA0 9416 bytes
SHA-256: 8884be2f2d3daaaae4830b8d0225a88509f1be3a8f20052079e4e988d66bb3a2

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