Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62306cb8f7cc04c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-19 01:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 48246a2392b6cf9789df3a61a15eec16 SHA-1: c569b71cf8932d3c42b8dbb81f98c3a0eea992ff SHA-256: e62306cb8f7cc04cb3e39ae0e589947bf9748b7101746cefb86df6c794e27f24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bestcoloringpages.com/userfiles/file/xorebuxibawejobato.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e431134---gitegopuxogamila.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/63072952572.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/56870346935.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/43802496504.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/sisawabexazalijexawaxubu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912191959557.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/99795890003.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/27920960148.pdfIn PDF document text
    • https://designclarf.it/file/ganotanejabemikokezeveri.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zavemewexelupumu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/36050967455.pdfIn PDF document text
    • http://chipgene.com/image/files/20210915_114743.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/29822384173.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/57927395150.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/dizavigupofosumamaziluvi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/79687504241.pdfIn PDF document text
    • http://davcpundri.com/css/file/sewuzelezegu.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/34615572906.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/25479852272.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/59219869204.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vodise.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/39984436153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+save+as+pdf+on+indesignPDF 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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 19472 bytes
SHA-256: 853cb25000a06ff91ab0d6b2e2a5fdd5cf836b5c869ed79e8470f12216671118
font_02_sfnt_off00013d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D90 10672 bytes
SHA-256: e1f990e997721ee4e74e2d04b2a7d5bd2c1c4b9888a693a9e8c31673746755f9