Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d534efc46adaaa…

MALICIOUS

PDF

65.6 KB Created: 2020-11-11 23:49:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5aff0681fbaf8c9199a0665fce12b8df SHA-1: 16091397fdfe3e7b9f9f34b1b5cae8e9549f4f0c SHA-256: b1d534efc46adaaadbd9dd8dd887b667a0175f622d808cf17da82e84dbafdef0
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://ggtraff.ru/123?utm_term=donde+estoy+ahora+meaning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413967/normal_5fa6277ea9043.pdfIn PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/wugegevanin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5f99e3e9ca1bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f873608058ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369782/normal_5f88a38110b48.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/b4be8a4f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376105/normal_5f9729db3484e.pdfIn PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/wizinamewene.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/powupimixarasa-senixuxonoko-webosuvitixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f9c6cd9e2b29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/1042033619.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/koxoxadosulovojaxexusewov.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/30068115193.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 5096 bytes
SHA-256: 0d5c02e51aec24616e0e5a3c3ea71ac3026ab1de1ec0d8651be7fb73e0c806a0
font_01_sfnt_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 11152 bytes
SHA-256: 908025f869215b163cc745af2cf7db0f23a6a7b9121ac04115d1a783ca9c4bdb
font_02_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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