Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a4e170a66383f0…

MALICIOUS

PDF

83.3 KB Created: 2021-03-12 01:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 215e5d21e67af079123adafa1573d0d9 SHA-1: 9dfd08e5853438a6d7e6d7b5a530dfcb4200066a SHA-256: f3a4e170a66383f0a59ff4f27f95405203732c32892db6303e15652f51d7b362
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=br%25C3%25BCche+multiplikation+division+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486061/normal_600f79c8b236f.pdfIn PDF document text
    • http://intekzafast.online/17211543788takkq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_602d2c7b69c59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fce9dcd9c44c.pdfIn PDF document text
    • http://adv-workshop.site/8682846166452npc.pdfIn PDF document text
    • http://lightly.store/zuseduzuvixe2v9q9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_603f9b6fc35e5.pdfIn PDF document text
    • http://just-gopro.com/what_is_a_tilt_head_kitchenaid_mixergz2ir.pdfIn PDF document text
    • http://nakanilo.club/juwatfptow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6026dfdc1da16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dabevejef.rf.gd/rexik.pdfIn PDF document text
    • http://josisuvo.epizy.com/wujupe.pdfIn PDF document text
    • http://tumofif.rf.gd/kejajiferuw.pdfIn PDF document text
    • http://ramufezumax.rf.gd/free_brochure_templates_pages_mac.pdfIn PDF document text
    • http://runugerobel.rf.gd/2000_toyota_camry_workshop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/45922265978.pdfIn PDF document text
    • http://vomifavub.epizy.com/free_music_on_iphone_website.pdfIn PDF document text
    • http://pozimefenud.epizy.com/95008553686.pdfIn PDF document text
    • http://josekopiguvalup.epizy.com/canyonlands_national_park_map.pdfIn PDF document text
    • http://pofisijakot.epizy.com/50192623956.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/jivig.pdfIn PDF document text
    • http://givaradipokez.epizy.com/zuwemuzajatudebe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF749 5572 bytes
SHA-256: 03479a78e1351d4839f1255448d41634490dfa3cdf92e55ecc8b57d3892c6087
font_01_sfnt_off000109dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DD 11320 bytes
SHA-256: d7dbef3dcaead4f196b7aae54d7f770c752a1bede277deb27792550677618c62
font_02_sfnt_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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