Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb28afe360877735…

MALICIOUS

PDF

83.9 KB Created: 2021-04-05 16:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f37757b3fa5d4d1887dcf05b59bdd28 SHA-1: 8243173b7576f8f2485684f5ad33d8fa22a332fd SHA-256: cb28afe3608777358e9b3c5d17275d1143c22c653b42364879b241ba6302bd99
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://zajinet.ru/wix?keyword=la+llegada+online+cuevana', suggests a lure related to online content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=la+llegada+online+cuevana
    • https://cdn-cms.f-static.net/uploads/4365575/normal_603146e90c09b.pdf
    • https://cdn-cms.f-static.net/uploads/4444649/normal_601b976e1e05d.pdf
    • http://dotekebenutedex.scienceontheweb.net/capresso_pro_coffee_brewer_and_grinder.pdf
    • http://zimezobot.getenjoyment.net/how_to_use_a_zojirushi_rice_cooker.pdf
    • https://static.s123-cdn-static.com/uploads/4475197/normal_5ff1cf18e01eb.pdf
    • https://cdn-cms.f-static.net/uploads/4371809/normal_605257712a065.pdf
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5fe35c1cccb7a.pdf
    • https://cdn-cms.f-static.net/uploads/4389384/normal_604ae512a3c87.pdf
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5fd0911b4d7c8.pdf
    • https://cdn-cms.f-static.net/uploads/4375698/normal_604ef8aead0f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_afedd1c1ab464391af18c6389751539f.pdf?index=true
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_e4ecc550ef82419a9bf7a2e1607b1883.pdf?index=true
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_89b33205bc7e4fa780f8f7b1ceabdb20.pdf?index=true
    • https://s3.amazonaws.com/tetofamuxulil/46530265023.pdf
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_d0bed76741d64e72a75e88b1553f8f67.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_bb79a3f0a4e441de8b670f876823419e.pdf?index=true
    • http://duvodix.myartsonline.com/86801155719.pdf
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_b8aac262e2d44b39a543bf3ceb12bb4f.pdf?index=true
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_4e82eb1f3b5c48a79488b0e737d056ba.pdf?index=true
    • https://s3.amazonaws.com/xonaxevetaf/how_do_you_change_a_timex_watch_battery.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_4abd9d4184ed4081af759370743b56d6.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/59513878286.pdf
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_be206862244f42d49f9de322423f2ffb.pdf?index=true
    • http://radiviwix.onlinewebshop.net/jeviwot.pdf
    • http://godusisoti.onlinewebshop.net/at_last_sheet_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109ef.bin
ac5e8a312b503e42ada5866a215f31492225821ae65d8b09e16ff2fc3cf4011f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 4836 bytes
font_01_sfnt_off00011a7f.bin
ba87a3bd7018aab7cb049f8355635510e6a9b1f797fdd3f5a0454d9084a430ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7F 12580 bytes

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