Malicious PDF — malware analysis report

Static analysis result for SHA-256 344d38b0ad54c5d3…

MALICIOUS

PDF

81.5 KB Created: 2021-10-20 14:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 910d52b559e31c99d21c995e91228281 SHA-1: acb1c9bf7d7b3a3d6f8c240059cc2d1c1736ac32 SHA-256: 344d38b0ad54c5d3c0b73320a1da8d8650328c48f9a6b549726a8d20b7b14f57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://amsaneeraus.fi/userfiles/files/8841753810.pdf In PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/61929329874.pdfIn PDF document text
    • http://esipro.be/userfiles/file/tukosis.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/99440939637.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/savukekawuluregopijogu.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/setuwasixekajij.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/bavelotufajifupinuxeboli.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/17982637975.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161666493c1eed---gofawomagidadatapo.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/somagakebivikapimiruzal.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161629c034ce59---4809300670.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/giwixawawomujasodosonomo.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/bogigatemaluxudow.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xizojopuxelik.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bewenumagomaniranimowapul.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/29065309558.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/tubiso.pdfIn PDF document text
    • http://pasaru.com/upload/files/zafilipokutamod.pdfIn PDF document text
    • http://abnicum.com/files/file/lefokatu.pdfIn PDF document text
    • https://davnosti.ru/upload/vupama.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/10/19/99016648803.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/13321408531.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/pazutitunovag.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/relowo.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/kigosudes.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/cmwvf4RlXg4/uplcv?utm_term=on+the+fritz+meaningPDF 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 10412 bytes
SHA-256: 196ac71549b08f6c687df7f0c88c9327765151cc5318242d6cbd40294ba75c38
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 19276 bytes
SHA-256: a1b5cb87950a1ee6301f09682f97cfe8e1ee8b219a719096ccf0ca62697151fe
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1