Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bfe66501ed1781…

MALICIOUS

PDF

89.2 KB Created: 2021-09-18 04:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6ff11b52747a5076b8bb4ccc4c7273b SHA-1: 2374934fb04193fc8550360d6ff48d17be5fd435 SHA-256: c5bfe66501ed1781f2b39a5cf3d5fd6277425b770524252648789ce750c3fc03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external sites for further exploitation, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://namlinhchisapa.com/userfiles/image/file/burej.pdf In PDF document text
    • http://rialta.ie/userfiles/files/rejumaxedanotatifixode.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/52316866963.pdfIn PDF document text
    • https://fasleh.net/Files/files/kubodim.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ded3724f9638a3d4e93d0678baeb7d41/29700072259.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/71641368568.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/87bf6cfb351d6f5683ce2ef78b06261d/laloj.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091222530835.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/60431110994.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/pokumizutefedopefafu.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901024455.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/56359138085.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/55912988764.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/58783051060.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/1631568906403.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/gafotolepotijo.pdfIn PDF document text
    • http://sissonne.hu/editor_up/96800395523.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/27411263907.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/17870269109.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/13030714220.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/69838115826.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/76833843668.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/tunidorojejogeripi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=program+do+wy%C5%82%C4%85czania+aplikacji+w+tle+androidPDF 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_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 11476 bytes
SHA-256: bf5adda2f54e64c1b77eb41062ea770dc81f6d42d3064da3f548b32e464c1833
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 18216 bytes
SHA-256: 0d3b17fef174754b693db5d6cbf6dad301fecd42232b3fc64029967624c71661
font_02_sfnt_off00013c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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