Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f621a10d3b3236f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 17:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c059e337e8e3f5406bb7d9659e45e3c SHA-1: cf968e452c37133f9cefaf7b624d0d875e9221b1 SHA-256: 2f621a10d3b3236f662b22206aef3dd2e9d6062031c558188d536b146cd0c907
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains, and one directly to an IP address, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URIs and the overall structure point towards an attempt to redirect users to a harmful document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cfo8p44ifitdvi7thsbsiq6b7r/77334906075.pdf In PDF document text
    • https://marathonlaval.com/userfiles/files/46362157051.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/xabanesag.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/37908413418.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/pusosizofitutilonuba.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74898746955.pdfIn PDF document text
    • http://jiab.net/userData/board/file/vetemogezutixumuxezofimo.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021981812328905.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/telam.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/dotomijeneja.pdfIn PDF document text
    • http://kammed.com/userfiles/file/71630759094.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/didababorejik.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/wozesa.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/28846785486.pdfPDF link annotation
    • http://okuninka-biale.pl/userfiles/file/44899554913.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/35501998457.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/kadutonafetopowopop.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3c68b6a1---99579327279.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/23389537199.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wowamufele.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/56964181980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+installing+apps+by+itselfPDF 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_off0000d303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD303 10908 bytes
SHA-256: 1e526fa33a59153ad052dc7b09675b1b0d5c98ec279ecd1fab9acb9bfd47cf97
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 17084 bytes
SHA-256: a3d7440594431541ec1d6e37ed0245e5aefc535ed542f8f82a25681a031afc06
font_02_sfnt_off00011827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1