Malicious PDF — malware analysis report

Static analysis result for SHA-256 a965821839ce9764…

MALICIOUS

PDF

64.0 KB Created: 2021-01-09 12:46:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0784fa9829e4b8b4bf1ba84c18acf0bf SHA-1: d33e60bdbbb01c75bb76fdc29fbdf4792a2613d7 SHA-256: a965821839ce9764d045deef5c43cddefe8c31898c59791f33bc57feb5451d1d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for phishing or to host malicious content. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting an attempt to create a link farm for SEO manipulation or to distribute malware. The ClamAV detection as Pdf.Phishing.Trojan further supports the malicious nature of the file.

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://trafftec.ru/123?utm_term=nova+deadliest+volcanoes+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/monasomeb/hddjj6x/men_s_table_tennis_scores_today.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/580dbe9.pdfIn PDF document text
    • https://cdn.sqhk.co/jasamomedam/MTsjNge/hen_sound_alarm_tone_download.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/3908523.pdfIn PDF document text
    • https://cdn.sqhk.co/xujuvotu/abdhip0/archipelago_lightroom_presets_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/dphinje/17375480132.pdfIn PDF document text
    • https://cdn.sqhk.co/mowogibewu/XXyKN6Q/lolaxif.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/dedinavesute/crack_adobe_after_effects_cc_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a571e90-3987-4749-bb40-30943f13e9b3/steve_madden_mens_boots_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20185bcd-b1e3-4a1d-a9b6-30a680c34b21/futowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bdfbd31-fec8-4596-8e9b-081231cdbb9e/80783846702.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/buwuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c72a99-83c4-4e1f-a0f1-651ba75748aa/final_fantasy_xiv_download_error.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_off0000be65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 5212 bytes
SHA-256: 82322417889f7fcd6acd5364e5d770847c657164212a01d399e8cd6df1b05bfd
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 10284 bytes
SHA-256: a78983639c54be02e6173a568035435c2aa3f55fd701b1da3fe1dd098b9efcb0

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