Malicious PDF — malware analysis report

Static analysis result for SHA-256 4838fca058863c88…

MALICIOUS

PDF

63.0 KB Created: 2020-12-15 20:57:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 272c6fffa9a5f62c0e97e70b131934df SHA-1: d51511c8752d327e5d42f1fb9ab338fbfd4ef57b SHA-256: 4838fca058863c883c8c3e62b94b6369c86024eee42d8f83be5348d6e35e17de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trafffi.ru/123?utm_term=der+geschmack+von+leben+stream PDF link annotation
    • https://jajigasusugase.weebly.com/uploads/1/3/4/2/134234637/jegevop_bunaxa_netupefuz.pdfIn PDF document text
    • https://gokivasinu.weebly.com/uploads/1/3/4/3/134334496/xepevofakujetib_ladep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5fc1c298b6585.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fccdb15465e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5f9377f9d7797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_5fbe071f4b9b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5fcb119bdb68a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_5fbb3fb39f992.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/kibudobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_5fbaf952ab3f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_5fac4ebe56a10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6d9abe9133927d90b22aa/t/5fcc7ade3ff1011540ea499c/1607236318717/guxef.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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 5476 bytes
SHA-256: 72063b6457706099d95f4b2f96c01241310a4c1a4b245b6231b00b2c6141a7fb
font_01_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 11324 bytes
SHA-256: a73b43f7469084a976fbce354c62b1be11c8b28eb6e5d56e7e117cb73ce870e3

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