Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cd9bc988434909…

MALICIOUS

PDF

78.3 KB Created: 2021-04-02 18:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 68e9bb417eec83af348686ead1488b5e SHA-1: fd2cccacd161a0b778c8963677c7019fbf263d8d SHA-256: d9cd9bc98843490923665d847f4dcd16a567f40605e0565b448d6389448e2e57
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 0.9961

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/123?utm_term=persuasive+writing+template+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366354/normal_5fed1e59ddc29.pdfIn PDF document text
    • http://menazubuta.iblogger.org/the_lion_king_full_movie_1994.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/yhhCCVd/katiranazemarinik.pdfIn PDF document text
    • http://setavifisotater.22web.org/24694140290.pdfIn PDF document text
    • http://rijebutaj.22web.org/annexure_a1_student_admission_form.pdfIn PDF document text
    • http://luxusirozutifud.22web.org/70447466398.pdfIn PDF document text
    • http://lizetadolanut.iblogger.org/adverbs_worksheets_grade_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_604711bab1858.pdfIn PDF document text
    • http://xilelul.iblogger.org/calendario_escolar_2021_sep_media_superior.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/Zxjb6fB/best_light_meter_app_for_iphone_2018.pdfIn PDF document text
    • http://enots.space/abbey_glover_please_don_t_got7rpk.pdfIn PDF document text
    • http://myfavoritesun.xyz/kavibuxujokamidefatewevfgjyd.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/jii6kcP/6167188796.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/V5Rghjd/technology_education_6-_12_study_guide.pdfIn PDF document text
    • http://kepibarufot.22web.org/54901065557.pdfIn PDF document text
    • http://nature-ital.space/93474471803rf3t3.pdfIn PDF document text
    • http://artyom.guru/tiput5rx8q.pdfIn PDF document text
    • http://probmaka.tech/79418188029w9o0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_603ab82bdb4d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_601f224f53345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_6dfa235acf734668a64c3105644ccb95.pdf?index=trueIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_2054c87b201046d89a8c95136ee12586.pdf?index=trueIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_44e6e8b542974e8cba53b4bc30b9f422.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_eb12f01152cf4282b049e90a781c2f16.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_2a12edfa42ce40e08158ff177c526ed8.pdf?index=trueIn PDF document text
    • http://mizebowofaz.epizy.com/83386178373.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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 5512 bytes
SHA-256: acc9d74368407c479c7e017e1e345baed48ed4eaef2c0d9d23a3905b994d0243
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 10940 bytes
SHA-256: 97b0fdfbf71da9a604626b74892eddd0ca8be1ddf77caaf6574efb5746b62903

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