Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e291f4ecb539ec8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 08:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 515d55d0973ae5b670fa94569ee87c05 SHA-1: fc8d7999e4ea94e84fd994e01f81310107e39067 SHA-256: 4e291f4ecb539ec8b120107fbda7cc983b7fe30126a2933e2b7b093d8b62e164
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to external PDF files on unknown domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://karlschool.org/uploads/files/202109010501308907.pdf In PDF document text
    • http://exosushi.com/uploads/files/74733206756.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/74401800026.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/81377617417.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/19945678976.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/18434176845.pdfIn PDF document text
    • https://tuinvandecruys.be/file/rawadedopefowenasivo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wezunarevolasokafipaz.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/91065282174.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/24414534444.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143e28cd42c7---xelunuw.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28142368311.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/91177500590.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/luvopib.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/46156082964.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/dafubupenobu.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/32859180195.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/jirojijomume.pdfIn PDF document text
    • https://aedwea.com/upload/foto/90081211353.pdfIn PDF document text
    • https://bunianco.com/other_files/File/65253477363.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/94418149917.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/77807402024.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/tabuzoreduzupamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chrome+os+nearby+sharePDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 10420 bytes
SHA-256: 59b904c6d01004995d06ebf550c94401e5e8cd27911c6b11450894db66a37f2f
font_01_sfnt_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 16692 bytes
SHA-256: 76a839306a50c2474c7cdeebd891ece765b7f435cb01230205888a4d493de397
font_02_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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