Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99fecbb2e3251ef…

MALICIOUS

PDF

75.3 KB Created: 2021-02-22 06:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a340c93322b066c99e58b36fe8aba82f SHA-1: 2e30659ef5a7d2c0f745f30223472f46b6234800 SHA-256: d99fecbb2e3251ef5bd1b6054a87991f3c0e6f1ead11f369f0b9195c6742ffcb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as https://jacksth.ru/123?utm_term=veterinary+technician+training+manual+pdf, are likely used to redirect users to malicious sites or download additional payloads.

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://jacksth.ru/123?utm_term=veterinary+technician+training+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/nexetifosam/H22sJhj/puxuramikivowokegelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382621/normal_6008f612c2ae5.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/emgdji9/34939381008.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/7467d3a3b2.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/jfjbgeE/copper_prices_per_ounce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_6003b4ee828dc.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/cYjaxf6/walovori.pdfIn PDF document text
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/4149617.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/nifisoso-betajirunugex-polirowimibikum-sovonevojulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462093/normal_5ff155daf28c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391047/normal_60093e7eb2be0.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/7398956.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/suletiw-toxovafat-pebuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 5456 bytes
SHA-256: 18f503ff2c0867db05fa0c0e9f6e6700d9f59b7e1c4df5fb4f33f228e84680f2
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 11852 bytes
SHA-256: 4bc4c7df2db5a7adb9238881265ea18419326033c5c89da620beddea6b65de5a

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