Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ee62761cc5bf67…

MALICIOUS

PDF

85.1 KB Created: 2020-11-17 18:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a9c638f0d942ffba6b487e8e6952fa45 SHA-1: d5eb553f3e6e2d9d39804e4eefc23b54d2f4987d SHA-256: c5ee62761cc5bf67a08f1b5ae9b45be5108d2f51600d2739fd29a14f953fa484
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://trafffi.ru/strik?utm_term=insanl%25C4%25B1%25C4%259F%25C4%25B1n+y%25C4%25B1ld%25C4%25B1z%25C4%25B1n%25C4%25B1n+parlad%25C4%25B1%25C4%259F%25C4%25B1+anlar+%25C3%25B6zet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369930/normal_5f8d43c4ecf07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5f981825eb45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_5fa5b9a16d20b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f9b9afe9c70d.pdfIn PDF document text
    • https://wesifepanegu.weebly.com/uploads/1/3/4/3/134337407/bixafulo-zoziwexugidir-wukevozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fa449b7178fd.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/henghuili-files/fivonoxezulevoguguvon.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/98492704485.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/daxoporew.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/electrolysis_of_seawater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b923b7ea-9589-4baa-8e1e-f59cbce43117/28976158259.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/award_certificate_template_google_docs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c05e415a-7230-4ced-8ffd-b797bb5f5d85/26552329768.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_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 5440 bytes
SHA-256: 4c9a14f7a980acc05ca8caad54e0f740f14d58d2dab0b382df1521b7d06bbc5f
font_01_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 13256 bytes
SHA-256: 5a0a47e5a5a162d956c2e08b86bd3041e089bdcd3d1f3a0d89f06358efe3cbba

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