Malicious PDF — malware analysis report

Static analysis result for SHA-256 a644894b08137e2d…

MALICIOUS

PDF

69.4 KB Created: 2020-11-17 08:14:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8a27ef2480b019eee2ef6c962e192865 SHA-1: 11a86e3d125bd07f38ba0fcaa3f2a616d3be2fd3 SHA-256: a644894b08137e2d5f9d8e14d65e99654bb2ee95a661aa61ff8d492eb0c93ba7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/123?utm_term=student+attendance+management+system+project+documentation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8eb3c945e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f8a75abe8d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f9236dfda401.pdfIn PDF document text
    • https://vokugekezigak.weebly.com/uploads/1/3/4/5/134592112/6bf99c2eb079cb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f8fad8b97992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f883751b0bb3.pdfIn PDF document text
    • https://netewubo.weebly.com/uploads/1/3/4/3/134325031/kisepubimopexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_5f9c496654769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419822/normal_5f96966d7a815.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/taguxif/vefonetikalixanaze.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/ernest_cline_armada.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/kajovoligadorux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc8e0dc-f60e-4006-926b-6c09031cffaa/les_pieds_sals_gurande.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3c1524-bc06-4a18-8f79-66f2794b8625/lakoni.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_off0000d1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F3 5644 bytes
SHA-256: e6c5af699c05a73b1b312eec9ab5e95cdf0164e92fcb7b84b8983f13b70fc734
font_01_sfnt_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 10296 bytes
SHA-256: 4c173ebd7c42f27ee31c8f884210ce125e597fcffc6522e6a7788d463104a4fb

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