Malicious PDF — malware analysis report

Static analysis result for SHA-256 114c563449c018d8…

MALICIOUS

PDF

76.2 KB Created: 2021-03-03 05:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b0a5ca515a65cf8a4271c76c5631ec4 SHA-1: fa03ae1c595ad7cae04a9e360e2ab2dfe7c7fbee SHA-256: 114c563449c018d84f6067eabd918da03dcca9f191a207409efc41d66780b280
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 0.9996

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 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://zajinet.ru/wix?keyword=classifying+polynomials+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/7hfjagd/pinball_museum_asheville.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fd21939a55cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5ff5c9295fec4.pdfIn PDF document text
    • http://puzivulagu.iblogger.org/jesuleb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_6017def0bc155.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/literary_analysis_essay_rubric_12th_grade.pdfIn PDF document text
    • http://gadolokelijibus.iblogger.org/highest_paid_jobs_in_computer_science.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/ii9OR3a/13051179635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_603e64b8129ee.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/hf9jdif/coloring_games_online_for_kindergarten.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/schwinn_spin_bike_for_sale_melbourne.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/igeidYW/survival_prison_escape_2019_mod_apk.pdfIn PDF document text
    • http://jozebifovo.22web.org/ligejudananirixelumev.pdfIn PDF document text
    • http://bipogumaguwe.22web.org/conqueror_s_blade_beginners_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejimafalun.onlinewebshop.net/95637882995.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/57920709731.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/kubusunadafagofi.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/annual_budget_template_uk.pdfIn PDF document text
    • http://sozazavore.rf.gd/dilutavewulalovategak.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/52170049347.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/app_lock_apk_._com.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5476 bytes
SHA-256: 86997c622ba053a77c5e324c02c4d314093625783d9b5a4f82b34d9f1eb67257
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10240 bytes
SHA-256: 8020dea15e7d34a81ddde3242917ed6a88c8364e6b8f35ddb15de3e8ef2bf8e7

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