Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73bc4dba7c230e4…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 18:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30c04e43224e1e7be7d5b7c4e9804347 SHA-1: f790127b538984984e1623e26fa5641c694b3597 SHA-256: c73bc4dba7c230e49df0cdf49b1101ff30bfee2a967f39244dc92224cff4e38f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=star+wars+d%26d+pdf PDF link annotation
    • http://boracayg.com/FileData/ckfinder/files/20210912_9D1B0120EF0798A1.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/tugopoki.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/48754085731.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/jakelomuvakesokaguno.pdfIn PDF document text
    • http://potlista.com/file/files/4568287406.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5ba60e30a---likuxuval.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/21034150682.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/96213391688.pdfIn PDF document text
    • http://saktigroup.in/uploads/91323768166.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/95200631962.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/47297096764.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71112720262.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/21204858906.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/94549259314.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/5523062787.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/motatomajavofiwir.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee21a9b3b7---ladibo.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/zadasobukukijexubi.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/72129969889.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/54456251539.pdfIn PDF document text
    • https://ismart99.net/upload/files/guwomoxutasu.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/kufunaduveso.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/89200393064.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/99341048965.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/nujutoxoruxikiwar.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 9908 bytes
SHA-256: 9ee5889d9fea9dae02b05ddccfbee138eca6f26052d00b56adfd13247c2e57d8
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 18468 bytes
SHA-256: df361371d6d2190ee6e114e5bc20970a53807f8b2c74a99f5ec8ecdc282cc934

Open this report in the interactive analyzer, or submit your own file for analysis.