Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb74380cd5e4c489…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 21:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 82931eeb0615c5eb1054218f8baaac92 SHA-1: bb89e8b2604c26b2b48aaee1b2b220469842c65e SHA-256: fb74380cd5e4c4896631da350e7a5c46c77496ed98932543d8946b7c5ed86945
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://seibyou-koujien.com/files/files/94547891669.pdf In PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/pisasunej.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hr80k5pht61a636qbk84401fgs/japamiberagibadubor.pdfIn PDF document text
    • http://3asoft.vn/img/files/jodaxane.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/rimalokixedaxovare.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/laxujaretanubulud.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109241637265420.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/fedalafotezu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6e4cf1cd37a102c91b512fa46f9966ae/mutupem.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/48762402732.pdfIn PDF document text
    • https://sunrisemotelbellevue.com/nbloom/fckuploads/file/xigogesosu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/84152023282.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/5783315476.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/91949213410.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/mufimuzomej.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/57616387941.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/xifetujawi.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/34202503978.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/38091707075.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/42052541386.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/xilejikagezuleberoweju.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/wotogosi.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/31339831626.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/49912607760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=can+i+transfer+texts+from+one+phone+to+anotherPDF 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_off0000b38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38D 10712 bytes
SHA-256: 6f35a59cac9f6ccf0363020d2e2c124f2f53a92403a84058b99084d59a687b13
font_01_sfnt_off0000cc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 17580 bytes
SHA-256: 1e185e957682a32e9f0506472000d5360083fa4496c3d1571c641504d668fd23