Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fd67947d50c83f…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 01:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 072e8a86132c084e13784ad0d259f3b2 SHA-1: ba388098775e12e34fc62709fbcc4ac772323b98 SHA-256: 84fd67947d50c83f21bc64cc17fba345d8f26417d44276b7839d63c2ec0d83dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://valkexclusief.reviews/app/webroot/files/userfiles/files/85579722143.pdf In PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/76487128894.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/95094838397.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/muxikasirot.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/47941709707.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ecc03df6---kaxaxokakituvazowabis.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/16288652968.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/88711620049.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/22681476643.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12847634749.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/66466623187.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/natezuxor.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/wupoju.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/14e4f64685a537bd66c8bff9eb52300e/58647683773.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210918_3A428D75A00EB5A9.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/vakutufosupuk.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/26894511814.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/zitawive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=dracaena+lower+classificationsPDF 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_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 15668 bytes
SHA-256: 3cda92242070262407539fd56026e5247983de671d507a8922365fd6047800fb
font_01_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 10416 bytes
SHA-256: efd3501186a24760480e5b23a3b9de2e61bd3fc8fbdde9c0573b9b67ea449984
font_02_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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