Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbf86e62d156bfc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 14:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0791423cdfb9f52f1b07705fcadea8b0 SHA-1: b9473ede269b2b3a6d30716310e89b4364a0e6b2 SHA-256: 3fbf86e62d156bfc98a8b48910885fd5994cf7702f066791e873e754879fadf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, with one specifically identified as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=snowmando+fortnite+skin PDF link annotation
    • http://www.toptehnik.si/images/76318516197.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/97614750378.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/76432259017.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/70340378798.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/79222985648.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/rilovuzis.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210913_AE8AE216A22AEF4F.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/forujajusekeromogageme.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/83483177782.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/bajibejakitob.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/puvelujapimox.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/26567304619.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109110509139156.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/33681518276.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/dawazirivasotonalapan.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/25385444520.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wixijitowefexogigodes.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/86386513549.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425db1b3ba5---vuvefoxamogevulijevada.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/degezijibenilofirur.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/86586766377.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/9528737994.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/34042980397.pdfIn PDF document text
    • http://ranch.pl/files/file/pelexu.pdfIn PDF document text
    • https://agros.net/uploads/file/3691273909.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/43290641396.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10724 bytes
SHA-256: 6fc07b23df71678c3fd37e24490774a5288b210e7914c934144d2b8b5570b04f
font_02_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 17188 bytes
SHA-256: 0f664aa0bdd697d188aedc26c7d8a76494e9aa7e309637e27b59b6c3ef25d779

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