Malicious PDF — malware analysis report

Static analysis result for SHA-256 9521f5c77b6285b1…

MALICIOUS

PDF

75.4 KB Created: 2021-01-06 22:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a3c94ec7c5542381e737e31210d5d818 SHA-1: 750291979a435e4de3033ee9b740cd25c74696c3 SHA-256: 9521f5c77b6285b136323cadc45b1848e5ad0cbe5dd6f53fba0361df36466bd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, including a link farm detected by heuristics, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, contains metadata related to PDF generation, but no direct user-facing lure.

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/aws?utm_term=mapa+almeria+capital+pdf PDF link annotation
    • https://cdn.sqhk.co/xufaribo/ihcidgf/zezubagugule.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/heF8ErN/animals_in_winter_kindergarten_lesson_plans.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/zixukexinufijalifi.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/sipekurizox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2380f661-7468-4ade-94f3-c7b9f2a6a509/65518164289.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/procurve_1800_vs_1810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46092fb-a496-4483-9e07-9629180bc6d3/jidomulifa.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/bosch_automotive_handbook_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b9ee9b-947d-428a-aa0b-890585223ac1/wodix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d92bf97-6992-477b-9cd6-2907013a6402/hidden_object_games_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/gulagupanepuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725bf067-8331-4c33-b9d5-79fce4c365ad/80853182295.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/broken_dawn_2_mod_apk_unlimited_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/7343800964.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_off0000ea8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8E 5128 bytes
SHA-256: 042722325dcc4bd721f136df0439798c7f58b0737bbfea8a1e5e0af1a7f229db
font_01_sfnt_off0000fbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF6 10672 bytes
SHA-256: f415a15b2fe3dcd220cb41c262039f7ea2704d2e1d24f44564af257cc98632cf

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