Malicious PDF — malware analysis report

Static analysis result for SHA-256 8964ef1039e0de18…

MALICIOUS

PDF

76.3 KB Created: 2021-02-25 16:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 238be301efd7ffde527894a9d3077979 SHA-1: 080fe8e197350c937d0783678346e86aea31c024 SHA-256: 8964ef1039e0de18f07a304e49c3c45492427bbb7aaededcb0e7d7cdedfa091a
126 Risk Score

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+connect+remote+to+hopper PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454286/normal_6017c582682d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412582/normal_5fee6b9d053a7.pdfIn PDF document text
    • http://passive-income.ru/los_temerarios_discografia_320_kbpsv1nhi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_601ca78915d3c.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ghfHUyA/91235513619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_60273bea07cb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_601a361149a6f.pdfIn PDF document text
    • http://bonus332.site/business_case_analysis_examplem1wv9.pdfIn PDF document text
    • http://1green.space/frosty_the_snowman_song_lyrics1fbm4.pdfIn PDF document text
    • http://paypallsecurity.com/zalojokidaputalemogasenu96iti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502906/normal_601787055f92f.pdfIn PDF document text
    • http://sfr-espace.best/palanca_polea_plano_inclinado_torno0q91l.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/xaluremiguf.pdfIn PDF document text
    • http://pitushok.fun/66165041517ctxix.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/hiL1Lge/digipay_cbd_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5fe0fe059b49e.pdfIn PDF document text
    • http://fb-ig-copyright.com/java_programming_language_tutorialbf01z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zozezofi.rf.gd/30575974132.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/cheque_payment_voucher_template_excel.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_off0000ee1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 4808 bytes
SHA-256: f9f04187fa51ac4aee7f4f3b38c3b240f425d7470f6c42975deb70a4f03222a0
font_01_sfnt_off0000fe5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5D 10988 bytes
SHA-256: 162d1999b2df5d5cba578cdd2d541586c571c1b5894f0dcb013990e88f097541