Malicious PDF — malware analysis report

Static analysis result for SHA-256 93db12cfd43cd654…

MALICIOUS

PDF

68.9 KB Created: 2020-11-24 06:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d8e9ab651823dd4458f495fae2db491d SHA-1: efec5189d828175c93905a17c4763482abae76d3 SHA-256: 93db12cfd43cd654273ad6ea50f7e3131ac34883c27ecb661c7bd28d64c4fadf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafficel.ru/strik?utm_term=fichas+razonamiento+logico+4+primari PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393506/normal_5fb4bb6c6657c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_5fa7e8fbe8b7b.pdfIn PDF document text
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/0f3d23c4f10e4.pdfIn PDF document text
    • https://jodonorinomudo.weebly.com/uploads/1/3/4/3/134316483/bd66625d212c.pdfIn PDF document text
    • https://tisefujuset.weebly.com/uploads/1/3/4/4/134488269/dukawus-linan-fubomuzidodibaj-zevazamila.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/5604964.pdfIn PDF document text
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/397400.pdfIn PDF document text
    • https://veborikaja.weebly.com/uploads/1/3/4/3/134317734/14b271fe614bbf.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/liguwubore/14975354143.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/92999952980.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/8777551687.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/appsc_group_2_syllabus_in_telugu_medium_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/3962510068.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/zatadesu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/network_security_courses.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_off0000cd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD61 5440 bytes
SHA-256: c61eeafab2198894745ff958525d4345bef06385d3b92f8e53ae6c25733448c8
font_01_sfnt_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 11308 bytes
SHA-256: 075dcf88487e2383db02d1f1cbbfc4184c7dfaaed0aa0c53a433ed78813be046

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