Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1fbb8218ec3e11…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 20:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4e998346bce33de80459e8dfe3e30c9 SHA-1: 5d73933909f36c76d04d795b4e684099d892fc72 SHA-256: 6a1fbb8218ec3e11dbe55c6cb337f85b101ba7cdb6db8712cdd0bb33f1a4355f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrusted domains. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://infrive.ru/uplcv?utm_term=hum+saath+saath+hain+online PDF link annotation
    • http://rayocazar.com/images/elfinder-1.1/files/file/97864925065.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e3e82722849362ec9f0606d71b8bd704/94137118900.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/xawimonefiki.pdfIn PDF document text
    • http://enewind.com/pliki/file/dugumubutejeko.pdfIn PDF document text
    • http://agavietnam.com/img/files/gobelux.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/dovodolaletefomajob.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/bagowofubu.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/delifetofazo.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/42118527444.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/90274088218.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109042300322973.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/buralikoxitixapazaru.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/98701102643.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/jedafotewoxerujopafu.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/fobilatezigadadigefopugu.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nokusabar.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/fibukurijokotopuko.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/13954876437.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/jibukut.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/palulusanafesef.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/goluforovujebukawivu.pdfIn PDF document text
    • http://js-space.de/userfiles/file/reraziv.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rajunasugamaxubinenu.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/loxufapepegag.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFE 23984 bytes
SHA-256: 75976104e4fa97db04dfbe492511a3819b3814b21fa78a56fd500897b2ce2976
font_01_sfnt_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16488 bytes
SHA-256: 0e08a90169311cdea2260f4c8d585980dece0db992f1eb57a5e9142424af02ae
font_02_sfnt_off00010fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 10364 bytes
SHA-256: 53cb01cc3b6206fb602202cf19ac6a99c5f90ac40893775304be5f63bb6efa20
font_03_sfnt_off000126ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1