Malicious PDF — malware analysis report

Static analysis result for SHA-256 275aa88decf3cecd…

MALICIOUS

PDF

81.0 KB Created: 2021-01-26 05:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: eefccfb1534922967edf629592f35aaa SHA-1: 2d2951711d7879754dba1eaa852528162e8acc25 SHA-256: 275aa88decf3cecd8709e81b55585073d57980978b5aa11046ac2ffca20e9ec0
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI that redirects to a link farm, indicating a phishing or malicious content delivery attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URLs suggests an effort to direct the user to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://seumenha.ru/123?utm_term=partes+de+la+celula+eucariota+animal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe83d7615783.pdfIn PDF document text
    • http://clubstore.info/wovasagolipunequk6i.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/8582835.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/zibolipibepadape.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/jidepifuban.pdfIn PDF document text
    • http://skidki-day.site/cup_song_karaoke_sing_kingpjtbz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5ffa7c35370ed.pdfIn PDF document text
    • http://pshcomonhere.xyz/kitchenaid_silverware_basket_falling_apartsx6ph.pdfIn PDF document text
    • http://agent-ritual495.online/ruzikamijevajenozinaxidmzay.pdfIn PDF document text
    • http://emmetrix.net/zombie_online_mod_apk_2._27._79z69j.pdfIn PDF document text
    • https://wadonado.weebly.com/uploads/1/3/4/6/134677460/doreduj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374698/normal_5ff7176f46c58.pdfIn PDF document text
    • http://womenit.space/zuvijebewuzibupanugowqkcqp.pdfIn PDF document text
    • https://sopesurikef.weebly.com/uploads/1/3/5/3/135317881/jiruzomoruxun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5fd95abbadd97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5fe7899bbdf02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_60065a65387d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5ff7ff15e7b58.pdfIn PDF document text
    • https://dojibosuxuzepi.weebly.com/uploads/1/3/1/3/131378780/5023503.pdfIn PDF document text
    • http://agentsoft.space/tubal_reversal_surgeryqkhnl.pdfIn PDF document text
    • http://center-about.com/music_party_video_songs_chiranjeevix9kc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 5084 bytes
SHA-256: 5eec0ebc74b1a536835d12e5dd472ec4d333397b2036c1ec1f2b41e126f41796
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 11468 bytes
SHA-256: a076218a38b77ea171ad6b46b09a8700bb2618de464ee3558fac4b910a9572c6

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