Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a5ca1633e8bdbb…

MALICIOUS

PDF

69.5 KB Created: 2020-12-24 20:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a02e67942db45e74534d1a0a3c9b0d SHA-1: 1d815e98e294faecc419a0b55927cc4ce5933956 SHA-256: 21a5ca1633e8bdbb7c008c19722ff6f299ae8b2678f00dcaae3bcc820d21d31c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=business+statistics+a+first+course+pdf
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/vabisulenujapa.pdf
    • https://cdn-cms.f-static.net/uploads/4387060/normal_5fbe1365371ae.pdf
    • https://liletizotefos.weebly.com/uploads/1/3/4/2/134234842/0ea8e.pdf
    • https://cdn-cms.f-static.net/uploads/4445749/normal_5fda133e1e863.pdf
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/benoxexose-makibowetula.pdf
    • https://cdn-cms.f-static.net/uploads/4453914/normal_5fb4a2454f193.pdf
    • https://juzugimigiroteg.weebly.com/uploads/1/3/2/3/132302883/juremojexu.pdf
    • https://cdn-cms.f-static.net/uploads/4377931/normal_5fa9a9bd83e13.pdf
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d812.bin
0cfe891e44afb291a3305aee55c0baf0b2a64f8438dbc8bb833bb7d714c45f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD812 5164 bytes
font_01_sfnt_off0000e9b7.bin
57532121292ab6bbe629e6fa5baa1f2a366b209027c8987573757c30d411710e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 9372 bytes

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