Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb9547c8479f291…

MALICIOUS

PDF

67.5 KB Created: 2020-11-14 01:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1d51f610c0b31c6b408464f761e1ba55 SHA-1: 15dd9ffb12b9c90f8e5e06ffd42392f8907b07f5 SHA-256: acb9547c8479f2919dfec8f25f6eee01044c2357f5a8492a83974776779f5b1e
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://traffnew.ru/123?utm_term=algorithms+to+live+by+pdf PDF link annotation
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/1225d667f.pdfIn PDF document text
    • https://witorovi.weebly.com/uploads/1/3/4/6/134643219/6383325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5f9fdee0da1de.pdfIn PDF document text
    • https://bupiwuzisulim.weebly.com/uploads/1/3/0/8/130874125/fubizubowilibuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f9f7db3185a6.pdfIn PDF document text
    • https://bazapefonufoteb.weebly.com/uploads/1/3/4/6/134637130/d0f57e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_5f90352d71019.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/jenofikekon.pdfIn PDF document text
    • https://wabozejitikaz.weebly.com/uploads/1/3/4/4/134495441/a191d6ff0dc.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/3063586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5f9c5f499d00e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f9db3e0ab283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed78262-c8a6-4445-82ae-4c821f18c536/21177070464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f38997c-4b5d-4a6d-8e69-ed11f3a80e8c/tales_of_berseria_guide_artes.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_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 5536 bytes
SHA-256: e666a9dd0cec89b8b62387c2fe1c89f2b84bff66842f1a178a6147963646ae90
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10148 bytes
SHA-256: a3cd7c5e3675c445deba8d2a1ca1c1c8c45ff15a6205c12b48475ccf887b6c00

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