Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cdea337e763f42…

MALICIOUS

PDF

78.4 KB Created: 2021-03-07 23:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 478089e32317251b07de8137c844f6c3 SHA-1: 5c3ea14d1d716b42038e77f2e863af46a8c97753 SHA-256: c2cdea337e763f428d7838418442bd269ec2e2d1c879feaecd22edd3ead60f56
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL related to 'towelroot v3 apk download'. This suggests a phishing or malware distribution attempt, likely using a link farm to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=towelroot+v3+apk+download PDF link annotation
    • http://majexifavel.scienceontheweb.net/discrete_and_combinatorial_mathematics_5th_edition_textbook_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393189/normal_60111aba5154d.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/chrysler_repair_center_near_me.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/xulagolasegikavigana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5ff2bee62ac99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_6022b5ba2ca9e.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/hbpjdDa/minecraft_pe_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407747/normal_6018b5b34b156.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/2nd_edition_dd_books.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_5ff2288e2627c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_6008d0c328789.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jihbkYC/rarest_blood_type_rhnull.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/wogunoxapufadojapatupavub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_5fe9bb0342582.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/nazowoduperalatalibotu.pdfIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_7ee81b9b610b44f68c1455d03a33c2d8.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_41da9516e37d4961981ced2441035f55.pdf?index=trueIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_f1235069cdf64a2188ed7efe73692e78.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_a9d3a8943b99436baacdb1e1d2c0b427.pdf?index=trueIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_1178545f3c5349bfa03035bcffaa31df.pdf?index=trueIn 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_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 5256 bytes
SHA-256: 4c6280998fa8e456a1d84408747ccb61ceeaabdad3c213730a0428ac7b65d7a8
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 5104 bytes
SHA-256: 82b73faa254f7645ddbe300b057c1400e336115d3604f250e272874e9d945f7e
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 10424 bytes
SHA-256: 3c000aabde5b909c1bccc16fde992441e0ef2d07bc85960cdbb554a431af17f1

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