Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74e5e535209cae2…

MALICIOUS

PDF

75.2 KB Created: 2021-01-18 16:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 676c7b8509fed4b40d17fca73bb00f2c SHA-1: 9d01336bbe348a12a6b3777bf6cfb3c33cb71258 SHA-256: c74e5e535209cae2338ae7bf95d0380b9968a5c5dd7b1bc240766562246c6343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or redirection mechanism. The primary URL, 'https://jottigo.ru/wb?keyword=royal%20caribbean%20international%20freedom%20class%20ships', is presented as a search result, likely to deceive users into clicking through to potentially malicious content.

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://jottigo.ru/wb?keyword=royal%20caribbean%20international%20freedom%20class%20ships PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505358/normal_5fc304f32d154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_60058182e6b28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482629/normal_5fee3de6f29d2.pdfIn PDF document text
    • https://keberalu.weebly.com/uploads/1/3/4/7/134725283/lopulotorelakamud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_5fb3830cecdb9.pdfIn PDF document text
    • https://site-1175725.mozfiles.com/files/1175725/76429646156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393639/normal_5ff917f13716f.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/vejosade-gupibo-josijafivigiti-defabiberifor.pdfIn PDF document text
    • https://toxovapuwelubu.weebly.com/uploads/1/3/4/7/134733969/vugurili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425504/normal_5fe4157fd9a43.pdfIn PDF document text
    • https://site-1173205.mozfiles.com/files/1173205/digestion_et_absorption_intestinale.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/jonora/43834382104.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/microsoft_access_2003_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/39827819406.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/70719955331.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_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 5644 bytes
SHA-256: 87b03618e15e06b25929c327292502cc4d5e4b2d17c92676eb8198a0d6d34bba
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10452 bytes
SHA-256: ccc0a085e33d19740c44cd36c607b45e60e25e21b43f2256d9b6739c1b558df2

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