Malicious PDF — malware analysis report

Static analysis result for SHA-256 7154c3a2a72e5df3…

MALICIOUS

PDF

73.0 KB Created: 2020-11-17 17:44:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a2c0adf062fb43f54321f8071ae9ae3f SHA-1: 199a9d89fc6ac17235c131a33cf59c1c13118980 SHA-256: 7154c3a2a72e5df3d98b01b1ad9c110dd183304b3195621ff871e7ddbe23cd23
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, and one critical link to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=festive+in+death+pdf In PDF document text
    • https://woruvewuz.weebly.com/uploads/1/3/4/4/134400058/0b1961df.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/viliwabefun-ramor.pdfIn PDF document text
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/410062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402933/normal_5f9c9915a3154.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/konikilivawagudigi.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/2484142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5fa3a4e18643a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/eureka_edgar_allan_poe_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/naramab.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/best_beep_test_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bec7b7-104f-49d3-82fa-569ab2d605ff/rimomuwukuneveruge.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_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 5016 bytes
SHA-256: d454cb0b8cf6bea210eaeff6e440b762938a72653c0a8a995392163b71e97d68
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 10772 bytes
SHA-256: 6b83f809b93e945db43a5e988ba7fac35ae16afa6bdd61b501df05b4fa81dee1

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