Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6bcd414d400e50b…

MALICIOUS

PDF

72.3 KB Created: 2021-09-12 16:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 69474b98c79b2e9337084829173c8575 SHA-1: a4d3d9e0fb7c68ee84867a3a4e27404e286c5a81 SHA-256: f6bcd414d400e50b66047cf96a1a09bda69dfd00208fa72039fd3148da461072
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms on disposable hosting, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=fancy+pants+3+unblocked PDF link annotation
    • http://webinaris.training/ckfinder/userfiles/publics/files/fomib.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead54ba866---xolelovavuwolasuzajufi.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/17969225421.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/popenofemodazelodalagar.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/46086165793.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/busivulifub.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/54729900006.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/97007484179.pdfIn PDF document text
    • http://kesifveotesi.com/files/babojudujuwomobe.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/suzosunim.pdfIn PDF document text
    • http://teraval.cz/res/file/30959875620.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/jixuvazunesodudo.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/66204987549.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedafiwekevu.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/bikadomovoponoruseji.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317b65c4c05---xisosawi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/54014740066.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082346165698.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/najuniritejisevufigidow.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/fijuvu.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/85490966704.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/10994397831.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/18590716785.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gitoxif.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/65622169874.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/zulim.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_off0000b8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FE 16088 bytes
SHA-256: 8ab72bd391b3137555986a0f961baa0ea096e455788bdadb048a48bca041908f
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10912 bytes
SHA-256: 92d20e7d543dfd26914b18121e8ac2690e8329be088d6b9e102e20752f5f15e7