Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a58c59bb4657a70…

MALICIOUS

PDF

92.6 KB Created: 2021-09-15 16:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5a1dfbbd217dad444a0404a4762fe98 SHA-1: 912162e721ab027e41babcb13a372d95f2cc8ed6 SHA-256: 5a58c59bb4657a709989b7c630cce92fa402dcef00cb3f95f0a690c31dac5641
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to disposable domains, which is characteristic of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate a phishing or malicious redirection attempt. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141e41e3efa5---67624885395.pdf In PDF document text
    • http://uralteplostroy.ru/content/file/46973106137.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bopunetalubopusixezisivow.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/49779942850.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/14792497736.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/23734039369.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/sonugepivepukadezaz.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/77864443095.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/logobavijadajuj.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/2909510429.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/tiwijabafaluzop.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161415425e9c80---fujaza.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/95625085614.pdfIn PDF document text
    • http://samtekelektrik.com/files/pabup.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/90221098280.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/4117746089.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/foviligalumume.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/20261042851.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/gipadujopibepemegerag.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/duwom.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/96065143046.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/2999163955.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/vemopakifoviva.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75153106079.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/13272265134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+ios+pokemon+go+spooferPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 19300 bytes
SHA-256: ccc828588eaed8e0ebb097c0088f95b935fe427e35e9f27871b3a32ed7d6d246
font_02_sfnt_off00014c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C62 10636 bytes
SHA-256: da367d6a256139a9825d7ce3d32ddf6330ae27359804cef0050a3b419e994b84