Malicious PDF — malware analysis report

Static analysis result for SHA-256 da408a8952a12b92…

MALICIOUS

PDF

70.5 KB Created: 2021-03-08 15:11:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 01fe1d8bbb2006a7975cac68f7ade565 SHA-1: 2bc54a0194b22c11b79610ff30012619168f6429 SHA-256: da408a8952a12b926c56bfe4906a0f92fe981a8d95c38669cfa0476b3fbfb908
156 Risk Score

Malware Insights

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

The PDF file contains embedded links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of external links. The primary malicious URL, https://xezojetit.ru/strik?utm_term=wordly+wise+3000+book+6+lesson+6+test, is presented as a test for 'Wordly Wise 3000 book 6 lesson 6' to entice users. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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://xezojetit.ru/strik?utm_term=wordly+wise+3000+book+6+lesson+6+test PDF link annotation
    • http://dezlice.ru/grade_4_maths_decimals_worksheetsl5dm4.pdfIn PDF document text
    • http://7lessons.website/how_do_i_reset_my_bose_cinemate_remote84gds.pdfIn PDF document text
    • http://thepropheticapp.com/jowosisanazonarutu0jxbh.pdfIn PDF document text
    • http://reduslimitalia.site/captain_underpants_cast_voicesza3y3.pdfIn PDF document text
    • http://complect-tech.ru/96175765681i22db.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
    • https://s3.amazonaws.com/lomiwexuva/pan_card_offline_form_procedure.pdfIn PDF document text
    • https://9fbeb193-358d-48fe-b9d9-45f8b63f6b3c.filesusr.com/ugd/ab67b9_c7a8799a54014609a7cd3ac3f88faaa4.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_0d0602fe00454f56aaff1c788baf466c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3122f76d-a5a3-4a6b-a531-8659d388cd19/juruselaripejezox.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_1e08109b2c5e4feea8aa1b40341b6d39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6a0144-c90b-4924-bf66-5cdf62c63127/vikepewoxek.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/how_to_clean_a_keurig_k10_coffee_maker.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_1f8c44985049494eadb93ce700512219.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_d3ed29ced30b46f68512c6e938ad42d2.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_650d6c45ca6c4fb39961c4c01f336d36.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minabiwa/19737243039.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_d44b88240de548ec905e8b083e8436bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e0bbfcf-73bf-4707-beee-b647145c2be7/coleman_mobile_home_electric_furnace_manual.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_8b3f447b351c4b36ae10a4892229bdf0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/56615818166.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/2016_ford_mustang_gt_used_price.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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 5268 bytes
SHA-256: 63a79caa091c2815b956a5b2b6cac497f2959b36d6544396afa82ffc352c6ac1
font_01_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 10048 bytes
SHA-256: ebe1015b02333af0f61b309562a69293c785df227b7956e7db00154b06edf1fd
font_02_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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