Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9fc139421fa1b6…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 15:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fb1cb67c57264de2438c7a55786c95d SHA-1: a54f45eb3e208fe029208be564874c90cb162294 SHA-256: cc9fc139421fa1b6bd79c46f13e4d2ed747007e1827e548a8e1206f8a618249c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely exploiting the user's curiosity or a perceived need for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tttinox.com/upload/userfiles/files/70884000164.pdf In PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/lojedakurepuwalupivujim.pdfIn PDF document text
    • http://heureka-cz.eu/files/nulesurulirasimixel.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/vofijazetodegedovesejugox.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/51388566940.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/munipupovi.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/21506096478.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/76658307538.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/jisegorinu.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/runivoxuguwasuvetimivabe.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/jakituzuwesusan.pdfIn PDF document text
    • http://vaynhe.com/upload/files/mugukosubebodikexigolawa.pdfIn PDF document text
    • https://5uempat.com/contents/files/jeteni.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/lulajawibilusok.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/69467598313.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/34313214761.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2de748cca---76503061108.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/79987873298.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/ruwanakasagaribedakevojep.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/5e796050991a60efb443f01cfcfd1bd7/97638362534.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/57872558933.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/39512238836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=croods+new+age+full+movie+online+freePDF 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_off0000b50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 10884 bytes
SHA-256: 760ba87793e158c446294e267974d0fe5439e95bd082ca1e188ee6b812f5d537
font_02_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 14920 bytes
SHA-256: 47c192cf03072046b98b8958d0c3139aed1b0ec3238784dcdf4f9caabb250f89

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