Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f78b5719aba06e…

MALICIOUS

PDF

94.3 KB Created: 2021-09-11 06:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2a1a9f6f188ec2ca091caa935b371dc SHA-1: 2c0f89308e3587905dded88e7edc3eb49d7bb815 SHA-256: 95f78b5719aba06e7fa31632e8ceab72447313d4424151ad3fe46b818364777f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=coin+master+hack+unlimited+spins PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f7109c3b---kazidudaxaxaliju.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ade495f76---48831648143.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/toxujasutowel.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/84915290704.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://radiosmile.hu/upload/file/zafivuzituxenapugirotere.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/30374906520.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/2622364363.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/laloguxozarabuxanago.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/72039701798.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/topuxixavar.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/63813917696.pdfIn PDF document text
    • http://glassick.com/userfiles/file/83625996447.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/78639637692.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/diwulofesifax.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dedekalonikow.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/vozuruzowitek.pdfIn PDF document text
    • http://linza-market.ru/upload/files/45235455459.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/siweguzomewavozu.pdfIn PDF document text
    • https://sim2007.com/files/kigel.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/31358526399.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/26729107211.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_off0001023e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A50 20880 bytes
SHA-256: a6342acfe0795cd93041aa2b9718ef76516a01f76642536d6fcc8b24bfd87156
font_02_sfnt_off00015197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15197 11000 bytes
SHA-256: 442741fb74a89c6a455c295c9770105b3ae8684e0df11398aca87dba2f324df2

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