Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b2d9be7905e7e4…

MALICIOUS

PDF

83.3 KB Created: 2021-03-31 08:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd1c50a3bba332026f03339e3724e060 SHA-1: 8e3ccd56232ff44d6d95eaca733729ec1ede86dd SHA-256: f6b2d9be7905e7e4b2203618c0bbb105cda30d91af26b38c54171e133db33d73
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying it as a link farm. The primary malicious URL, 'https://xajibur.ru/award?keyword=administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+idalberto+chiavenato+pdf', is likely used for phishing or to redirect to further malicious content. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/award?keyword=administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+idalberto+chiavenato+pdf
    • https://cdn-cms.f-static.net/uploads/4465930/normal_6026a622c6bc0.pdf
    • https://cdn-cms.f-static.net/uploads/4451231/normal_600a573f5e692.pdf
    • https://cdn.sqhk.co/xuvisisitinu/iiaBFgg/10320040967.pdf
    • http://rejasikega.scienceontheweb.net/60428616758.pdf
    • http://budokudepa.scienceontheweb.net/budapest_travel_guide_download.pdf
    • https://cdn.sqhk.co/welosezu/hThaPAQ/41179904871.pdf
    • https://cdn-cms.f-static.net/uploads/4392463/normal_602638ae15e50.pdf
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600d24e3cbc26.pdf
    • https://static.s123-cdn-static.com/uploads/4491439/normal_5fe2866ec3eff.pdf
    • http://jebebixazonutug.mypressonline.com/vuwovuz.pdf
    • https://cdn.sqhk.co/tixuniwe/igfiajc/demetrios_chapter_3_apk_free.pdf
    • http://lulopoboxefon.scienceontheweb.net/64284383070.pdf
    • https://cdn.sqhk.co/ledodatefu/iihgXhi/crazy_for_speed_hack_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://temodorofeg.atwebpages.com/belajar_bahasa_inggris_toefl.pdf
    • https://uploads.strikinglycdn.com/files/481c9e64-9438-47a9-a22d-1ab8c91cda2d/tafotu.pdf
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_1b63932749c944dc908d7f8553db7ff4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0edbbf3f-9408-4f9c-b82c-86edfdfd89b9/tissot_touch_titanium_solar.pdf
    • https://uploads.strikinglycdn.com/files/7407bd60-ba09-4f15-ad86-14e70e945b7c/the_birds_and_the_bees_talk_script.pdf
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_9f706c3b8b8743068a5fe1eed470c097.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_428f860fd152417f92d81017b08d922d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5c5ad00-9e26-4c70-865b-bf5dcfe1635f/12084629427.pdf
    • https://uploads.strikinglycdn.com/files/3a89a0ba-d96a-4fae-88c1-6f83140f2471/57256660283.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebce.bin
e21df4fa6d5b274115af0a4d3d845f7e7a0ba98df41a387426181c6b57750db9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 6084 bytes
font_01_sfnt_off0000ff84.bin
53accf2c48a09da9334ed704830317c8da5f68569498a4510efd6b1d5b60873d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 13284 bytes
font_02_sfnt_off00012759.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 16204 bytes

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