Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd0e3410aac6c7f…

MALICIOUS

PDF

65.4 KB Created: 2021-01-16 06:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 21c4293541b1cd8db3754c5d5b569ce9 SHA-1: 1e7d9254a544f78d5610926fff194586a0381d06 SHA-256: 6fd0e3410aac6c7fd4f8e1f7ddfd7fbcec57a60235a05ab140afe9eeb0d98919
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent external URI points to 'traffnew.ru', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a secondary payload.

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://traffnew.ru/123?utm_term=aisd+2020+to+2021+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f90992848f10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392862/normal_5ff256863db74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_5fefab120c31c.pdfIn PDF document text
    • https://lezekuzog.weebly.com/uploads/1/3/1/3/131378913/soniweva-linetivojeju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5fed0212a5458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5f9bc9415a1cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_5fcf1bc061160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/99861067340.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/83528899543.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/7653884314.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/kevivel.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/30620272130.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/hollywood_movies_in_hd_sites.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/scert_assam_full_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB853 5036 bytes
SHA-256: 3e3092ae7ae1d31b53f4b7fbafe97f075fabec5254c17957879c7fa43a5c984f
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 9724 bytes
SHA-256: 0c62bfbdef66d4e22e0de4897577dddc92865b81aefe2d96ad895eff1b797d66
font_02_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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