Malicious PDF — malware analysis report

Static analysis result for SHA-256 528b4739b989d50c…

MALICIOUS

PDF

70.0 KB Created: 2020-11-25 08:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 84ff3df7018cb523733f59bec634ac10 SHA-1: 6121c4ed367176a81773d9f2fb17ccc469969753 SHA-256: 528b4739b989d50c406dce21f33d84182bb1eca0afeba446007bc06c9442f46a
156 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 0.9997

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://traffset.ru/123?utm_term=tnt+events+2020 PDF link annotation
    • https://minibimegoviw.weebly.com/uploads/1/3/4/3/134333268/falebep-mipole-fibusepolu.pdfIn PDF document text
    • https://suxomaloki.weebly.com/uploads/1/3/4/5/134598925/3b97752bb38611a.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/lazavozom_gamerafudo_vuwodogijurapu_nifuxubura.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/rajufanobovufu-kekaz.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/c5440036914bd35.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/gagagakigibapo/risatujedazefafew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ec00cd-69bf-4d8d-a39b-d916bfb85acb/76895960231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d516e8c-0526-4b9d-a1d3-6441e6b20474/86403417846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435014b2-94e9-4130-b436-9aae12f4d7ee/rerudakilukeful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9fcb05-4634-40d3-8a53-d83450c14013/45401006342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c5a9e2-c204-4d79-88f4-39825566730f/totijetononanize.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/83374950756.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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 4624 bytes
SHA-256: eb3ac9f97d6189d07692a335c00ef906578e68e62f73b8868b48903aa9acbf23
font_01_sfnt_off0000e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE585 11208 bytes
SHA-256: d00a0acb898300ce3b55ef0c5c2c9992531517eab5f4d7425c062231bb6c50b6

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