Malicious PDF — malware analysis report

Static analysis result for SHA-256 7371d524a0c20792…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 14:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 290c1b6f0d155fd0ce2bd18fff24876c SHA-1: 2f76012d1495dd88a1ea2f7a20594f7f2662278f SHA-256: 7371d524a0c2079212f0e3b89fe5525693a205f5c9ee82d25fb1df1c488ce247
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier assigned a high probability of maliciousness. It contains numerous embedded URLs, many of which point to 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, common in phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://vigova.vn/Images_upload/files/67921629480.pdf In PDF document text
    • http://gerd-pollak.de/userfiles/file/duvojaralegupogozumido.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/tagogubizekebekapowezi.pdfIn PDF document text
    • http://standardamulet.com/files/files/dubigokufosubarubopezev.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/23355438117.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/wovudimed.pdfIn PDF document text
    • https://novitas.ro/files/juzibaribiz.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/wikobumexapabiz.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/4908568677.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/sosefagu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613349c60fa37---84296241680.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/72005496739.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dilebiberoremoxujadupo.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/kedofakifube.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/wojizemivazazakis.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/52377888229.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/83243086348.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/vokazaxulopipenosiropat.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/47259106435.pdfIn PDF document text
    • http://domosplast.hu/files/file/jogijujisezid.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/69436949105.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/49652429770.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/diwafarafudilav.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wakorafora.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/wafozoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=matrices+multiplication+worksheet+with+answers+pdfPDF 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_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 11156 bytes
SHA-256: d1443f54f6815ca2dae3e8f440aca511e32159160bbbfecea8764c2a3631dfa7
font_01_sfnt_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 17988 bytes
SHA-256: 9013ffb514000e096ab43faaf66855384d1d9250a9bde7b0ee267e46a97a49c2
font_02_sfnt_off00010ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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