Malicious PDF — malware analysis report

Static analysis result for SHA-256 9633a3ec9a9c0e1a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 21:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3425c2d721e4f7882122c29f6a42a85e SHA-1: c9e12b56b3395cceb09cf41bcebcd6e4d48ed0b4 SHA-256: 9633a3ec9a9c0e1a78b6de44c2f2f2076ca356075625908cb6d89568b402a83a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The primary lure appears to be related to downloading hacked software, as suggested by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://camelcarpet.org/d/files/94177492099.pdf In PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/ginitonisanokapigud.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/nukevazisojesawem.pdfIn PDF document text
    • http://ausietech.com/images/file/51629159483.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/dixupufodefawesonug.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/23299839076.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/viberetazulal.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/39233605400.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630573222311428173.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fc833f001f52c0aeb18475db04a0a095/79453173515.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/70407481238.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/68628248218.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/80128889371.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/xububuzupiwexovapejaj.pdfIn PDF document text
    • http://orthodoxnews.us/file/nolalimazuxopo.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/petalu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/52593138326.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/ganajebujug.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/15053999471.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/83476797445.pdfIn PDF document text
    • http://belean.pl/userfiles/file/28005963198.pdfIn PDF document text
    • http://bdnchem.com/upload/files/42058769023.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907185621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mini+militia+new+version+hack+mod+apk+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_off0000ad38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD38 14916 bytes
SHA-256: 07c5cde9ed2068186551a4165a639b9aa194d7edc8a7aa214f2b5971d296fc25
font_01_sfnt_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 11016 bytes
SHA-256: e23d270ace10a75ff6b8271b2ee2888e1167ca87372b817ac9707b97be292a92
font_02_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1