Malicious PDF — malware analysis report

Static analysis result for SHA-256 62026b21523ea35f…

MALICIOUS

PDF

72.3 KB Created: 2021-04-02 23:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eb35976f65bb4f2adf33553db9e72f1c SHA-1: df21ea48560b12bd801a89661c59a1dd41496f83 SHA-256: 62026b21523ea35f2b0a1c0e829635df0c2dffd06cf2e20eb892c4b37a74430a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://golowaki.ru/award?keyword=barron+s+toeic+3rd+edition+pdf PDF link annotation
    • http://kojewotezigu.iblogger.org/vutigunetob.pdfIn PDF document text
    • http://contarinihome.com/44103012254esgml.pdfIn PDF document text
    • http://wosuxetomokife.22web.org/balance_sheet_accounts_receivable_net_realizable_value.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_603479816055d.pdfIn PDF document text
    • http://perfectiona.online/vojamevusuxd6bih.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367019/normal_5ff0e94f86436.pdfIn PDF document text
    • http://mylevel.store/fluke_dtx_1800_user_manualbk8ym.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503578/normal_5fed9012c2414.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojupodinitaxug.epizy.com/59958850238.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_3b0269e939b3457894bc9858ec8b2510.pdf?index=trueIn PDF document text
    • http://tosuniwenalob.epizy.com/53071939740.pdfIn PDF document text
    • http://fuvenofagimugo.epizy.com/passport_photo_app_android.pdfIn PDF document text
    • http://xaxidos.epizy.com/english_grammar_worksheet_for_grade_1.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_9bdf3ff4fcc64ebcaffd2d66d1edb1a6.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_7fd7b5176a29478ead815ccd5b828453.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_a8bc48cf3f6b4f17941742ace281fec5.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_2f408c67d618439eb36f5234e5dd65b6.pdf?index=trueIn PDF document text
    • http://bibijovefuvak.epizy.com/71520729161.pdfIn PDF document text
    • http://lazevemu.epizy.com/55328327035.pdfIn PDF document text
    • https://fc59733d-949e-4df9-817b-fea2515c5cc7.filesusr.com/ugd/689329_2e960000c5b247d89256d3019a2e5231.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 5332 bytes
SHA-256: c99ed3fd97bf67ee95baecd227bba82efa44b8dde0a68215615b3dcdf43ef563
font_01_sfnt_off0000ed9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 11200 bytes
SHA-256: 30a3914c5ceac47f47d17e8c38263f45ffce80f3c8128fda193d0d54828c9187

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