Malicious PDF — malware analysis report

Static analysis result for SHA-256 d831b73c5a172d59…

MALICIOUS

PDF

64.0 KB Created: 2020-12-16 12:45:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: abcb2a557e306ffe85d9e5cd2ecf94d2 SHA-1: 9bf37e103fb0676dd9057254390e805221e8412a SHA-256: d831b73c5a172d59ffb7a0933ab6bd07e66080219375a3aaad8f6336c72ba2bf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or redirection mechanism. The primary malicious URL identified is traffset.ru, which is likely used to redirect users to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/123?utm_term=what+technology+wants+summary PDF link annotation
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/fupepukak.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/mexavofezoxi/rejenewolabegap.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/wigun.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/elite_dangerous_trading_guide_reddit.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a84402915d4a16f9ca82/t/5fc8ce88ec83506b048307c0/1606995593216/wapiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/jugixikonebopuwinovidesu.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/birthday_invitation_card_template_free_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0a9a7-0e4f-4e03-9be6-faf3fcb53718/76473762973.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/cotton_eyed_joe_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b74db7-124a-414b-82da-a659af63928a/bifajovasesazomawimax.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_off0000be5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5C 5420 bytes
SHA-256: b27ae964b0d156fa5da5c980f1d875470ddf1120049b183084a00d534a6427ab
font_01_sfnt_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 10356 bytes
SHA-256: 10f72380b5962f736a1ccae2debe90eb7e562e533171fcb200cedc2216f06d81

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