Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c165e2c22fcb43f…

MALICIOUS

PDF

73.5 KB Created: 2021-03-16 16:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ed18f677a5596d234b55ce8d2e4202a6 SHA-1: 39eb6f701efceea8756777466d1c05462b59ea83 SHA-256: 2c165e2c22fcb43f7c16b04f7fb9b3ebcb0c950fc74389184ba4d1466c163a9e
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The presence of 'powershell_virus.pdf' in the document text and the ML classifier's high confidence score suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs strongly imply it's designed to redirect users to malicious sites, potentially for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/wix?keyword=doxy+harry+potter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4527902/normal_5ff57ef257b66.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/govotabisijexoduvora.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/mixarafexilorazupobim.pdfIn PDF document text
    • http://romeita.fun/definicion_analisis_financieroelfnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5ff4c976bb773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479223/normal_604ec2b4887ce.pdfIn PDF document text
    • http://promooffer.site/academic_word_list_toeflidhka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_603311d759c7d.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/how_to_remove_windows_powershell_virus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_60342da9d27fa.pdfIn PDF document text
    • http://picsonair.com/world_series_of_poker_2020_youtubeo47v9.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4426260/normal_6031682ca04fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/44In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/1985355739.pdfIn PDF document text
    • http://wogurep.epizy.com/29323013592.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/nilagipavani.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/tufujifinobiro/avg_tuneup_2017_full_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/sudesabarevujop.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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 4868 bytes
SHA-256: 54bb63ce18a7a93e26633b238d2431f3935a1fe678a9eadd8dfd6a6ed1b6a072
font_01_sfnt_off0000f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35B 11160 bytes
SHA-256: b915077ec4f9511ce0220b36f6fb88ed64ae79f21df74af00a13a305236468c0

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