Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a72d5ceac8ed3b6…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 08:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a667918edbb606c360e6c3b3bc9599a5 SHA-1: 0714a3ad08d7a8e2d7813bdb84cf7f5ef52e635d SHA-256: 4a72d5ceac8ed3b69a563a5e1d44299e648a82b24871526aa0c890f849f752db
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 malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains a large number of links pointing to distinct, potentially disposable hosts, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the presence of numerous embedded URLs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://griby.biz/ckfinder/userfiles/files/86775253006.pdf In PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/37776365966.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/31855610249.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8416715c---gumufarupobaserofabun.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/64039868778.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/bomidalalu.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109071808591833.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/72277351992.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210908093441.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/7392981618.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109060001536365.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vosenafekamezejuv.pdfIn PDF document text
    • https://keongracun.org/contents/files/25737889973.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/9792038869.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/96817948797.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/xebezunawadexemejelozunix.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/30926666486.pdfIn PDF document text
    • http://12shio5.com/contents/files/15391597480.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69470814161.pdfIn PDF document text
    • https://felicityokolo.com/file/93536934095.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/u4cmu7rf8td6krkic8e43u1p72/42222703522.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/diviripapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=call+of+duty+black+ops+zombie+androidPDF 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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 17872 bytes
SHA-256: a3b9ee7febd6a172b67cfd779cfbd3956a78972789ce58d1591d16a0d126e5a4
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 11320 bytes
SHA-256: fd6661759c60681a83da37031bfcf0634cc71733e556555f7ca47b8c581d4163

Open this report in the interactive analyzer, or submit your own file for analysis.