Malicious PDF — malware analysis report

Static analysis result for SHA-256 9627123ce900a79f…

MALICIOUS

PDF

93.7 KB Created: 2021-04-04 05:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d3c90686894e96038269e27542abb7d3 SHA-1: b541e0bfa5e60320b898ea5ea26138428998efb0 SHA-256: 9627123ce900a79f115229edaeda2e5b3ab0577c6fde63e8198012ec9ec93cb1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains heuristics indicating it is a phishing lure, redirecting users to a website that appears to offer a free download. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded URLs are likely part of the phishing infrastructure, aiming to trick users into downloading further malicious content or providing sensitive information.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/award?keyword=definicion+de+aptitudes+sobresalientes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375909/normal_6039592f4664c.pdfIn PDF document text
    • http://skidki-day.shop/sumoduwipinutuvmqo6a.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/vezuwamowax-dirafufali-jivojokulakevu-fukijuretij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375509/normal_5fe5c53dbdd9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_60410b091e674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5ffdaaa912c11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5fcaab3c05c37.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/ghhbig6/rubulikugugopesilibubimi.pdfIn PDF document text
    • https://cdn.sqhk.co/menasimax/tPiijhz/62887389925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_60648b94f3dea.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/ocohgyA/faxonorewu.pdfIn PDF document text
    • http://richmaya.site/starry_night_ragnarok_mobile_answersm6im.pdfIn PDF document text
    • https://nekuferalota.weebly.com/uploads/1/3/1/4/131406939/wixosid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387224/normal_5ffa5963d3b0c.pdfIn PDF document text
    • http://gufutaca1.xyz/film_tomorrow_when_the_war_began_2010fbzal.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/jfWfFdJ/75708975667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7e1611e-f78d-4dfd-b5ce-3be5f579732f.filesusr.com/ugd/4b76a6_05849882585e4910a2af602cb777eb6c.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_5f83437579694b228748e55adb5d65ed.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_3f512430a7664d328a0553388e13f6bb.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_off00012f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F30 5288 bytes
SHA-256: 79626176ca7de11a9f0e42ebd2d0884fde18317a9b21fe310ad1088329a15100
font_01_sfnt_off0001413b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413B 11868 bytes
SHA-256: bd2f4ac3206b92435b36424cb40216ff9c9a5ba147f0c2a62817d1dc5b37fd4d

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