Malicious PDF — malware analysis report

Static analysis result for SHA-256 65931f5068561853…

MALICIOUS

PDF

81.8 KB Created: 2020-12-30 04:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 84938bac549cdd4efb6d200086ddab46 SHA-1: 614adf3e9b0d66b5e156591d9ab8189c839e3fb0 SHA-256: 65931f50685618532e899b4109346982fcb14da6baae0b516f10977858a6f683
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to 'trafffi.ru'. ClamAV detection and ML classification strongly indicate maliciousness, specifically as a phishing or trojan. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/123?utm_term=monologues+from+into+the+woods PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459640/normal_5fde545ca2239.pdfIn PDF document text
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/jaxixuwesejitijub.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/2546af39-2fc1-4bf6-9d0a-6573b1eaebd8/jasofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/015789b6-ed6c-4a88-ae3c-9a578d007572/good_words_that_start_with_letter_n.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f7ca19-1193-43af-b009-81d9ef67cadc/pidul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61762a78-4609-49c5-92c1-279f025ca711/94929562601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23717689-872b-44a2-a9a8-51ea173e5453/download_captain_underpants_books_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a166319d-91df-415d-b244-01f95b3e1944/bdo_mystic_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4930a02c-f48f-4e08-a7f3-e92e030522d5/piramuzasopumepebomuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf8f574-90e1-4fdb-9d2d-2663b4c39f67/slither.io_zoom_hack_extension.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_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 5208 bytes
SHA-256: 41db4873ced619cff2e277cacca29f54634c9f4def8be7c82bd55c50df81c67f
font_01_sfnt_off0001119e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119E 12224 bytes
SHA-256: 9d3f1057aedde63ee269f2ff376c5439bbf319f4575273184f3753300d66f931

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