Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef21804cb055b69…

MALICIOUS

PDF

77.6 KB Created: 2021-04-02 17:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2cb04a2176aa79cb509f6e19f8cf7207 SHA-1: ef731c50a394769a4ec09d1ab14a7288cd7b4342 SHA-256: 2ef21804cb055b6954380417619425f2bfd0df7c2327e5aed91afaabf94a3498
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/wix?keyword=pmbok+guide+5th+edition+harvard+reference PDF link annotation
    • https://cdn.sqhk.co/labifikup/Ethe0hh/f1_manager_2020_series_7_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/ieAQjiK/20736184528.pdfIn PDF document text
    • http://dusanaputojinon.mygamesonline.org/historia_de_la_administracion_cientifica.pdfIn PDF document text
    • http://normab-id.com/is_philips_pasta_maker_worth_itypcx1.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/FjaXget/jezurofuzi.pdfIn PDF document text
    • http://nawemofukewo.medianewsonline.com/gofebifuxuxoxejufuronuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fc640b15c8bd.pdfIn PDF document text
    • http://bbflowers.net/tozutebinelugadijewamebapoemky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416504/normal_6032b4a19cd28.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/jgdgfjf/petroleum_engineering_jobs_entry_level.pdfIn PDF document text
    • http://murimubijejaba.mygamesonline.org/67735741055.pdfIn PDF document text
    • http://dorightpress.com/forest_exam_answer_key_linkzhmpb.pdfIn PDF document text
    • http://ag-management.space/167672672185okls.pdfIn PDF document text
    • http://rankingcoach-seo.com/sherlock_holmes_1_tamil_dubbed_movie_download_in_isaiminizzhte.pdfIn PDF document text
    • http://vumogegotawugub.mypressonline.com/27866486681.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/tYhhgg5/tux_racer_ubuntu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461219/normal_5ff3278b90d41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_b5b8fd86c2204deebb27132cc844a8b7.pdf?index=trueIn PDF document text
    • http://sizemogigu.myartsonline.com/excel_formulas_list.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_e73908c51f1c4c149cdd80148bbe4585.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_off0000ea8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8D 5616 bytes
SHA-256: 412e3539c7eccb9d5c09ba598a4d2613a2b61466827112710d473c0dd7889a9d
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 12152 bytes
SHA-256: c7279f083de5e384703a4eb52b506d3b1768524ff9cab1716dec92c7772319ba

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