Malicious PDF — malware analysis report

Static analysis result for SHA-256 5759d361e99de1a8…

MALICIOUS

PDF

76.0 KB Created: 2021-10-03 08:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 20daa712e7ddf6b367ba8422bdc57dd4 SHA-1: 224bc03295ea3aac9ff93d6b840ce897f5a98d59 SHA-256: 5759d361e99de1a87c4edc86877f0515a22839bf25444edc54da2e1b8308b06a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://tsnpharma.com/upload/files/rifolo.pdf In PDF document text
    • http://lsneotek.com/ckupload/files/92586139164.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/76604377804.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c96ba874a78e6802b9a065d197982bac/damijubaji.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/99676111311.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/35671065736.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/dijowogobal.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/falerugufefatusiliwela.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/84221439228.pdfIn PDF document text
    • http://shouce-image.kuchuancdn.com/Public/resource/files/51706054789.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/kotejokasigarugamagabilu.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43363626774.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/dawiwonimur.pdfIn PDF document text
    • http://karikatura-kovarik.cz/files/file/jipafizakali.pdfIn PDF document text
    • http://benrassam.com/uploads/files/53626759694.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/lonoxijatugezezevudori.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/sakodo.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/66375509531.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/46595856755.pdfIn PDF document text
    • http://hbinpol.cz/media/images/upload/file/2251716578.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/67173381828.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/60246538231.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139be04c73a9---72819286091.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/24589573595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+outlook+email+to+pdf+with+attachmentsPDF link annotation
    • 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_off0000c019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC019 11220 bytes
SHA-256: b5aae2d52f94c5361677cabe8f6f3d890228fc12a81a6eb990449b4e0c9ab641
font_01_sfnt_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 18468 bytes
SHA-256: 6dd5cceeb5dce02355b361d1844a7853a715c2a17b534de172054f17acfc7fcf
font_02_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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