Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da2736db156b723…

MALICIOUS

PDF

81.8 KB Created: 2021-09-24 00:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b49fa4566467eac276a141ca3f609d57 SHA-1: c5359959f579d13f4613d97625f9951e1d0431ce SHA-256: 6da2736db156b723fc12bf0355455fe3f82f776850f84308ae849fd47ba6cf52
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to PDF files, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used as a lure to redirect users to malicious content. The ML classifier also strongly supports a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=android+secret+codes+for+micromax PDF link annotation
    • https://1ar.sa/userfiles/file/48976717847.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/65547540859.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130591074a40---28460259653.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/watolusup.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/10277986305.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210903225118.pdfIn PDF document text
    • https://ewt.cz/res/file/31089108273.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/54644684321.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/14325068715.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/pevuduxiwisofekigareradog.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/39460724702.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/92796646017.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/41123428844.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/vidiwazababapir.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/45528940517.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79056055748.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/40345488677.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/mowuwizawinivi.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/duwosifadixusi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091907375273499.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/vapemelufusajeb.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/xawujudiw.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/17667067343.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/80894045403.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 10676 bytes
SHA-256: 36587de89d2dede574247d5299ac4be325995426157fdcafb8f2b37b3228bb47
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 17424 bytes
SHA-256: 4ef04aa5ad61c6a135f40f3d8c504b380ddd2d8ff8159441480f28f9a56f8c84

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