Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3ca5dd23300a59…

MALICIOUS

PDF

41.0 KB Created: 2020-11-08 03:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: abf5b76ccc9a58e0744a4705c136a811 SHA-1: e27f3b820a314f9b61c40cac386fcd973ce25dce SHA-256: 2b3ca5dd23300a59f5aa4487025855c58e21982e1226eecf8a3c0dec7a409edc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external links within a small PDF. One of the embedded URLs, 'https://traffking.ru/aws?keyword=watsons+go+to+birmingham+study+guide', is flagged as suspicious, suggesting a potential phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffking.ru/aws?keyword=watsons+go+to+birmingham+study+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5f98988785ebf.pdfIn PDF document text
    • https://gupamawuma.weebly.com/uploads/1/3/4/6/134602371/nomakaj-relobabux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f88fa35d7597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_5fa734b211481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454670/normal_5fa14d275f64b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5f9be33a2fa32.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/f3de7d2e-e21d-41fe-9e78-e4c6865f22d7/simizitorovagigoralibu.pdfIn PDF document text
    • https://debulavoj.files.wordpress.com/2020/11/specialized_london_langster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8c3336-c4f0-4275-a78b-eb9da047ab17/heavensward_anima_weapon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685ec863-a00b-4b96-b62a-2bc4c248579c/ver_serie_la_ley_y_el_orden.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156a3900-b8cc-4798-8da0-368652e87eb4/pareralewiworariwilesedu.pdfIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/11081911224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bfa02f-f31b-427b-a1ea-5737a56e3997/pho_and_roll_menu.pdfIn PDF document text
    • https://wunizodozu.files.wordpress.com/2020/11/12689420593.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_off000061ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61BA 5460 bytes
SHA-256: c88285b00869a3cfab7f884b05d1d68327a70dca683778fd0af154e262a058dc
font_01_sfnt_off0000742c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 10264 bytes
SHA-256: b428829f201ac8b074aeab642d6389bf52268dd262504b3178e0981eddb2cff2

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