Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5994f575a7555f2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 03:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec6c1cd6aef0a840dba057af7d1822c9 SHA-1: b61330893f34d1c311bac24c79174b451d6d5a8b SHA-256: d5994f575a7555f20adf21942f151767e7bb74d4de56e1a2e3db34e41e975eb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to create a large number of links on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=custom+switch+android PDF link annotation
    • http://automotiveenergy.cz/userfiles/file/27319870526.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/gawolidizudanop.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/dedepuresoberixi.pdfIn PDF document text
    • https://thepainter.asia/upload/files/79955946719.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/juwebumakarudezok.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zogaxutox.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/69317851262.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/94541307505.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/53095146895.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/ripox.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/fotiro.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/59634527495.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/52889596792.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/lasolope.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae80b77eb0---99676842058.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/31489932813.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f15f170---9280028648.pdfIn PDF document text
    • http://rabwork.com/media/file/61150997026.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/11047723448.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/winozeg.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/28846732231.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/difikupopugufixilulaponeg.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/22673379048.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_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10676 bytes
SHA-256: 444d7deea712d702289f2ffad713487eccebfb43b55e1960dc36b56ca2818e1c
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 17192 bytes
SHA-256: e9e9fc70ad9573c8dd01fa14f52db7081af3ed3be25263c0f041efc26bf35cf5