Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ebe3ee748f95ad…

MALICIOUS

PDF

73.7 KB Created: 2020-11-13 16:36:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 12b9700c5d7c8382124ba6d325205501 SHA-1: 98a74768ab9a62dcc2744b7765918c745a717a6b SHA-256: f9ebe3ee748f95ad3afe351c83b28d5c8b66f75f40dfa8df1d1ab6bde2fe6515
156 Risk Score

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 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://traffine.ru/strik?utm_term=kuroshitsuji+cap+12+sub+espa%25C3%25B1ol PDF link annotation
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/3128930.pdfIn PDF document text
    • https://dodupezuvu.weebly.com/uploads/1/3/4/4/134443873/sejapakeba.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/0fc2e986-2362-476a-8631-754a3c571276/fadogorokixi.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/vowel_diphthongs_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/sobuvuxopugumirupitogeg.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/sekezuvub.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/download_bemba_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8376231a-c4a9-4c30-92a6-4726a2a4acc2/xufaxopanexifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5423e314-dc79-4fa4-a69f-b858a6c48fc1/39334400687.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/7772350437.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/9231132719.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/6760635281.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_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 5604 bytes
SHA-256: c322852252080b122b6caf203b0a378edaa48fc5aae65f4ade9c166c452bcd4a
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 11144 bytes
SHA-256: 475bc5b1820c6d5c264b6d4c90275c552bc35c1d990cfd95e3968fc0b3aec1c7