Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a45397c385a6b75…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 13:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 45a86da3fa4db924f1a81cfd860410e7 SHA-1: 3ba6607353d9109b74284b5a98c5097671ec4ce2 SHA-256: 4a45397c385a6b75bd2066b0ba2373d44a002f96df2961a1f133c6b0b79a7300
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://arnetbilgisayar.com/upload/ckfinder/files/45848894319.pdf In PDF document text
    • http://celeb.huh.hu/UserFiles/File/55387035387.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/28028962050.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/pudod.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b391a9de4c---66194505925.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/78016488724.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/soduz.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/vogalulafus.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48131595073.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/lilafur.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/danenogezalosi.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/tenogewavunuginome.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/76446052604.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/10204732152.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/ronemitopolijazetolujuv.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/jefumefik.pdfIn PDF document text
    • https://labelmarket.eu/data/file/vegadaji.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/17375552124.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/97576595333.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/12566315041.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145429d4915d---birufewifuluwikatofurimow.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/73635995829.pdfIn PDF document text
    • https://intersat.lv/files/file/bodenipazetatazoju.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/24461319494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=javascript+for+beginners+pdf+free+downloadPDF 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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 14364 bytes
SHA-256: df5c3b9a9a0697c93b13e571ffc35dc206d93dcec052f6a22e56d9fc0773509f
font_01_sfnt_off0000d2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 11080 bytes
SHA-256: dae652cadd4e8191297351c0479e351011c05a9b979d5bf50abcabdff076be32