Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6235b2f40db1d93…

MALICIOUS

PDF

70.4 KB Created: 2021-04-05 21:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 42e230f83a74936b8d8aff6d455d0c28 SHA-1: 50c21fc5fe6fd7985b484c498279b3cbce98e684 SHA-256: a6235b2f40db1d93144fdac39d984e032394fc806b20af04310edb9251fec656
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/wix?keyword=vstar+1100+carb+rebuild+kit PDF link annotation
    • http://zexejodubaxiku.mygamesonline.org/physics_symbols_name.pdfIn PDF document text
    • http://buytoday.cc/the_constitution_42nd_amendment_act_1976fp0ec.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/88295818155ttfuy.pdfIn PDF document text
    • http://rajenajodaf.iblogger.org/luvozeriw.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/anlage_n_2020_formular.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/49441635907.pdfIn PDF document text
    • http://gunisone.iblogger.org/1430424479.pdfIn PDF document text
    • http://ekzo-fruit.ru/sukegipidiwenad8hcnt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_600eb6259fdf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_600e23c81ccbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605a483e37a4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_600670b6293b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_6c7f3485f5f444b79a12dd89dfc6f393.pdf?index=trueIn PDF document text
    • http://nuguvumaxexuwus.rf.gd/45165370091.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_ffca8a1af5a94087ba0172286e4d706f.pdf?index=trueIn PDF document text
    • http://madukavinoxonal.epizy.com/2284013128.pdfIn PDF document text
    • http://zekafoweratum.epizy.com/dividend_go_on_balance_sheet.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_d768cf442503463dbd68e9b19d66f9c8.pdf?index=trueIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_e434ac4ed2ed491fbd9f05d42e142388.pdf?index=trueIn PDF document text
    • http://woxikajir.myartsonline.com/vomev.pdfIn PDF document text
    • http://fejewipup.rf.gd/4498547572.pdfIn PDF document text
    • http://kovemipenege.rf.gd/mafilojivonadomis.pdfIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_58a3fddc48144afb8fedca876bf55470.pdf?index=trueIn PDF document text
    • http://botasalipigu.epizy.com/temivupex.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 5296 bytes
SHA-256: 294d062a4ee98fc1dceee0405965a49c36946be1a6fd7a7236bb0519c1b9345f
font_01_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 10568 bytes
SHA-256: f44b6466cbbeb25776f3d80862f26d096d0a635a575815bf05a3889b0fc9f312

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