Malicious PDF — malware analysis report

Static analysis result for SHA-256 6664f0d939a7fb17…

MALICIOUS

PDF

82.2 KB Created: 2021-02-18 20:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3b6e260d21a6e4efd4d682e9b33deb57 SHA-1: de405323590f470c8aadda417ba9d0aca33d38f1 SHA-256: 6664f0d939a7fb178c6443b4e3d7d7af32f6dac0647b53e4a9f3a5e53ad10a51
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=washington+dc+covid+testing PDF link annotation
    • https://cdn.sqhk.co/zujubokave/orhgdjg/fish_dish_liver_cancer.pdfIn PDF document text
    • https://gonajomu.weebly.com/uploads/1/3/5/3/135383834/lapodiwulene-fuwunulotu-gofajomos.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/215850.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/bjgEgcE/xagewani.pdfIn PDF document text
    • http://alcexpress1.xyz/916823229265omg5.pdfIn PDF document text
    • https://nofuxufemi.weebly.com/uploads/1/3/2/6/132681390/6852013.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/fcAgehf/yu-_gi-_oh_gx_duel_monsters_spirit_day.pdfIn PDF document text
    • https://sanositew.weebly.com/uploads/1/3/1/8/131872303/sisaxorawu-befobodaxago-zujanebilomanav.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/fhchhDT/vuxitidafoti.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/tizowodifi/xalarijedazajufetowokakiz.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/javefoziliresadasosoj.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/91731914097.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/d_b_credit_report_login.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/75528275657.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/wagokijiniz.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/vegefipozotumoso.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/59691835431.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/2019_acc_anticoagulation_guidelines.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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 5144 bytes
SHA-256: 660e27640dc57f723a530030b896789f439ed3769d4fb7457801655c48729fd9
font_01_sfnt_off00011675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11675 10992 bytes
SHA-256: 6bab1426427c8fe83f7f1ef81fee8ad495cea2d8abfdbdab5739df4b996b7cbc

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