Malicious PDF — malware analysis report

Static analysis result for SHA-256 df861fc4ccd64342…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 13:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f73bce0ab4b699782628bd38eb9a67b SHA-1: f181f8c28b1fbbddf9aa2586d29b2b8bc9180b75 SHA-256: df861fc4ccd6434272d61454a3a637b8a257681cbf190f6fe5a45c0fcce24207
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role in directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=hindu+law+books+pdf PDF link annotation
    • https://stoneappeal.in/FCKeditor/file/70419614124.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/56685403545.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3cc39a34655e5e3846b96de951b93cf6/tujisofaguvibisowotupujaz.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/84192713173.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/dumiketojasupe.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/razezanom.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/98930965475.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/sotefupoza.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/16471205354.pdfPDF link annotation
    • http://nickels.design/ckfinder/userfiles/files/133357329.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/mawosa.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/nadoxewul.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/66349298525.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/37469729865.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/ligurususamalujujekib.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/76274663884.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/51131051712.pdfIn PDF document text
    • http://rhondachem.com/d/files/fipotinuwipusazewukoza.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/bixuxusukakozozobe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 10572 bytes
SHA-256: a857bbefbabe13a16fb3d9c4068c7957a3a6abc4a47ace71598b559d47468056
font_01_sfnt_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 18504 bytes
SHA-256: fd55000977abdcfd21cfc7e7dedc00e2feb7dee5f7d8f76096fd7abf499e8b6c

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