Malicious PDF — malware analysis report

Static analysis result for SHA-256 403603efa4e62ad6…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 04:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8b1766a9b27993e171295f55ec75204a SHA-1: dbce6cbf7d7e8fafd9703a5c4b222b5d5ae980ef SHA-256: 403603efa4e62ad6775f6bddbc73c0fee993c81daac964555994d88cc75cb1ce
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. The presence of numerous external links, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sys-svinding.dk/userfiles/file/10080648060.pdf In PDF document text
    • https://reniuved.it/file/17253220818.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/64830978132.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/61189336372.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/lipez.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/97390590848.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/vurixa.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gajida.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210910_F468F87B250FB761.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/basesitakiwoxumig.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/2693977486.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/44620968949.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/kutererisiwizogiwufakev.pdfIn PDF document text
    • http://ausafe.net/images/art/files/5859601990.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/44654438932.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26528651079.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/99844074753.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322fa6937d8---65992165260.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/gijivemid.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/56553957563.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/90670134795.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/35495673048.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/62667475011.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a921491---17004484611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pubg+download+android+obbPDF 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_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 16184 bytes
SHA-256: ae8f4bbfa029965ff9e79acdce67badace9d4bd73ec8193e9aa11b7c82d3c7d1
font_01_sfnt_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 10352 bytes
SHA-256: c4a7562fdbe3e3d475987f56dea950d01808afda2de8906a89e8e97daf50805b
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1