Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7f90a060916a29…

MALICIOUS

PDF

60.4 KB Created: 2021-02-10 00:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ca4249959fc47072e1c24497cebb82b8 SHA-1: 391f0d1cd550885e5f9d46efaf47e80a449d1559 SHA-256: ec7f90a060916a29c1ab797157ad9076c9725ec1fffd02ec6cee265cdfb8bf5d
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 0.9996

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://jottigo.ru/aws?utm_term=certiport+console+8+setup PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383156/normal_5fc62d0754770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464715/normal_6005bbe7c5cc5.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/6e47485b2f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_601d07f602b87.pdfIn PDF document text
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/bab67b8a4b7c792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448733/normal_5fe391129228a.pdfIn PDF document text
    • http://naturapple.space/alistair_dragon_age_dialogue_guidey63o3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fe17e9f3c74a.pdfIn PDF document text
    • http://ogranicbio.space/vinojonunozizozip4ksos.pdfIn PDF document text
    • https://dixatuwep.weebly.com/uploads/1/3/5/3/135398053/b20a9a7f36b.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/tutasujal/canon_g2000_installation_guide.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_off0000b2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DF 4816 bytes
SHA-256: cad130aaceb3048764157fcd23d8d4596a31b383d639d0a790a2ad0c8b084737
font_01_sfnt_off0000c350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC350 9956 bytes
SHA-256: 3eceba7a348fc8faabeac8dfb347d121c7e6776a2c86cd676a46c777ddc9d9a5

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