Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edf7549bd4cd41c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-12 18:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 81c21aae75c7c88c7c64c8f61b058a65 SHA-1: d52407f3109254ca6278e02dd08ebe55fb4ef17a SHA-256: 4edf7549bd4cd41cc1814e3a9224345ea53ce8232bd541a88365d37d2ac95629
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, likely to obscure the true destination or evade detection. No scripts were extracted, but the presence of external links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://buzascsaba.hu/userFiles/file/dijufekagasejorof.pdf In PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/gebepuwotus.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/10883412050.pdfIn PDF document text
    • http://only-svet.ru/upload/files/68741271056.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/39887926868.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/96464548300.pdfIn PDF document text
    • http://goldmustang.ru/files/files/73498722687.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613847063d3c5---73655680272.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wozodaloj.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/71531265951.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/97742632557.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wasadiwav.pdfIn PDF document text
    • http://xycrusher.com/d/files/pakamulubiwa.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/xejuxadogunigosuzefotu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/37594305352.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/xitijewun.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/77306381088.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wojefepuvekapopipinoba.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/38935517347.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/45452275411.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/07c3dc48e122d2c19f076908e2d24c9c/33873837339.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/fafuxewopavunojomuwaruno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=top+3+best+fortnite+skinsPDF 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_off0000b245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 10508 bytes
SHA-256: 16dc0de42dc06e74c22f99488f1aced785eb4e989e8d488d62c66474fc9f5aab
font_01_sfnt_off0000ca2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 14916 bytes
SHA-256: b28d38d30b741b364c479765098425f6b00ccacc419dcc977b898f69a1c1bee9

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