Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f0d072c793591c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 07:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6a8f410cea029e41bc5f6a3490dd417 SHA-1: 0e484704497728d1e2c83e166f311aa1247d3cdc SHA-256: 97f0d072c793591c28661bdb240f0779c12cfd0238e9d9b5e413f601394f77f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like nature. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests a link farm or a distribution mechanism for further malicious content. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to exploit vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maschimaurizio.it/userfiles/files/rowizapedimulovi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732a859807---58329550290.pdf
    • https://businesslife.com/content/files/74710775023.pdf
    • http://domario.ru/userfiles/file/71416810400.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613638c56e705---geluvolukanemarusiru.pdf
    • http://janaturismointegrato.com/uploads/file/fiwimobewumenu.pdf
    • https://beautyyaurient.com/editor_upload/file/55547330769.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ripuvuzigi.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/modarivugitolukiz.pdf
    • https://rimsball.com/ckfinder/userfiles/files/98905569950.pdf
    • http://fsoa.cn/userfiles/file/72534396408.pdf
    • https://knoxvilleremembers.com/media/nonusijivufolapewimup.pdf
    • http://remont-m.com/userfiles/file/78554885253.pdf
    • https://luminex.pl/upload/file/jolisoputud.pdf
    • https://leganordavigliana.com/uploads/file/26678134685.pdf
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/59143841606.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/jigomegurogesavomevameran.pdf
    • https://kildevangen.dk/files/88126039490.pdf
    • http://loscogliodifavignana.it/userfiles/files/wukupuxapisipenam.pdf
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/68706314256.pdf
    • http://studioriboldi.eu/userfiles/files/43519700119.pdf
    • https://plewmal-d.com/Uploads/files/91448345936.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/gekojolisalogubiroge.pdf
    • http://studiozammuner.eu/userfiles/files/mepogupapaxiwovakapomuso.pdf
    • http://denis-lefebvre-services.com/fichiers/file/dugalakavevixepudat.pdf
    • https://embassyinvietnam.com/webroot/img/files/nojej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+latest+shows+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed2a.bin
6c1366a2f5109de0d43268321afa5cbfc85e33a4918d57a10c1907efd9b08f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10512 bytes
font_01_sfnt_off0001051d.bin
a9eee827dbe4a2fd3731096f3459221e4845530e6bbca231a565841be2657346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051D 18176 bytes
font_02_sfnt_off000133d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133D3 16792 bytes

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