Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c0a8f1420bd747…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 22:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43d3741eb5ff1e5aa2a344fb60a1320f SHA-1: 024b74bd685783e7e77e86018b6d2fc80a7ef2f8 SHA-256: e7c0a8f1420bd747a544377015fcf4cd62e0153130a537736a4d66d42bc55b71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are structured as link farms on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=1984+george+pdf+download PDF link annotation
    • http://zajazd-broadway.pl/galeria/file/lusadomolekomenipebod.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/poxokaxotabewawesev.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/megiraguxajazasenixem.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109120447029023.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/84733824498.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/77453269331.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/47242661967.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/46943650107.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/81806716890.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/daxemaw.pdfIn PDF document text
    • http://signauction.net/userfiles/file/55364927069.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/40951951005.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/70664528031.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/jasasoboxigotamuz.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/40514406407.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/marixiki.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/63284193078.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/90366088614.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/20046265860.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb3646351---vitabiporogef.pdfIn PDF document text
    • http://pololanna.com/user_img/files/98983456883.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/65299555595.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/kilawenixiruxiteker.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/womuwumibujomixulose.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zajokimorotis.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_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC10 10808 bytes
SHA-256: 18fd434c7baa5bafbf6a094a4e247836d2fd6f9faa2f7f1febf43a6be50aeaad
font_02_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 16076 bytes
SHA-256: 2951bbc659bbb8020c0bc69fd860eed5a10d1fc5b601c20c0af7424c6ccbdc4f