Malicious PDF — malware analysis report

Static analysis result for SHA-256 283f11cd96c88974…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 09:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49ea220df3f9747e007f88d5d16bb1d4 SHA-1: 84546d144fe31561463aa2baa418d795ad21219f SHA-256: 283f11cd96c889743085d47c93c303251269432f812b4682d4010efc75f81293
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to harmful content.

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://ketchas.ru/uplcv?utm_term=download+game+frag PDF link annotation
    • https://sapporopools.com/contents/files/72681001053.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/24608380186.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/dikadorefujur.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/28551397985.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/pewobarilowisa.pdfIn PDF document text
    • https://losungversorger.com/product/file/60882192597.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a29990c3c---50753043439.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/sasaleditanir.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/09c4d9ab7fe318c1bebed8088f1d4157/lumevebomupanoxif.pdfIn PDF document text
    • http://special-pharma.com/upload/files/vipuw.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210918202417.pdfIn PDF document text
    • http://scoutpate.de/userfiles/file/vugiwoke.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/66395400691.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/13869804342.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/21774996705.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/54022012136.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/9913142355.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/jerigi.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/remofikefapefupigeba.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/51911396896.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/58684504168.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/nokevorojake.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/kibitulilafusabuvivinon.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/9076736448.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/66052466011.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/73509328183.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_off0000bead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 10428 bytes
SHA-256: da5dcbc5cc278739703515f4307c91ca92f332d38dfa12959e27d93a028d7b6d
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 16456 bytes
SHA-256: 2613fdbd5e52ba010f23488e14d549843dbe37d808ebf30e15ab5560d5c933bc
font_02_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1