Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d9982fe44bbb44…

MALICIOUS

PDF

77.4 KB Created: 2021-04-03 22:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0eae3f70b5e3f01d96f34eaf1caf5cf4 SHA-1: a7104beebd817ba000ddd9274843c8ae2a11b57e SHA-256: 96d9982fe44bbb44b693023ac03f22f043b6abe14227d493c0b643b2b3a9e20c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL containing 'keyword=the+russian+revolution+worksheet+quizlet', suggesting a lure for educational content. The presence of multiple disposable domains and link farms, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/wix?keyword=the+russian+revolution+worksheet+quizlet PDF link annotation
    • http://ozalupa.space/uc_browser_apk_for_windowsshkkb.pdfIn PDF document text
    • http://fewutame.getenjoyment.net/surah_yaseen_with_urdu_translation.pdfIn PDF document text
    • http://hookup668.site/711082930415d4yq.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/5309159.pdfIn PDF document text
    • http://rozewevojalel.sportsontheweb.net/40458861168.pdfIn PDF document text
    • http://vladport.ru/jakunosejagosemk6w8l.pdfIn PDF document text
    • http://productwood.ru/glamglow_bubble_sheet_mask_review33dpn.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/bediwigunu.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/zopejikexe.pdfIn PDF document text
    • http://prizinsta365.online/beautiful_place_wallpaper_freejds47.pdfIn PDF document text
    • http://buytoday.cc/full_hd_1080p_video_converter_freevgfa7.pdfIn PDF document text
    • http://gsmall.space/jikimowelemikelit17pah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_0dc419cdf9914c6aacd5277c7b2bf48a.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_fb88c884c54644ad9d6c06ec49256df2.pdf?index=trueIn PDF document text
    • http://gobiburitumeri.epizy.com/hd_movies._com_2018_bollywood.pdfIn PDF document text
    • http://davinawoguzag.atwebpages.com/56200827486.pdfIn PDF document text
    • http://jamudux.epizy.com/tumowumojugizadine.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_364f452fbb1e4ad6b0fe6a4176bb6f71.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_a261760cd3414ae9b93bf5c72741fe8c.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_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 5116 bytes
SHA-256: 95f4de93a41d03ff22283d9661f782d6753e05a319258734aedb4ebc73eca452
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10600 bytes
SHA-256: 11d200b15675eee05190277be88c9bd8efbdd12851047d483c7d99aa2ce2d0be

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