Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d372baf7ae8f727…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 14:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c595754a073b156808c681ba09ad60ef SHA-1: 5fbcd9358bcfc8b3db51a423d1bbc3c5cf9e4a9c SHA-256: 7d372baf7ae8f7278e26834afbed5fce0f7dfface8dc3d538adcfe137e37143a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=baltimore+ravens+android+wallpaper PDF link annotation
    • http://amidoux-peintures.com/ckfinder/userfiles/files/rugugobexofonemusos.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/35426650451.pdfIn PDF document text
    • http://bastola.org/userfiles/file/toweliri.pdfIn PDF document text
    • http://confidence-ist.com/ckfinder/userfiles/files/37490330353.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/rajibawiwumafagewa.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/27866107248.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/vobojebevu.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/nefad.pdfIn PDF document text
    • http://sns.hu/_user/file/bababagoropefosate.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/rowira.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/roduxefilimevasogexeduz.pdfIn PDF document text
    • https://ysh.my/userfiles/file/44273125769.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/76153278737.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/razirojaku.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/60242762338.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/koleluleri.pdfIn PDF document text
    • http://c-amc.com/upload/files/zimazuwepawabapo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///pitolaturujupetesipojolas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613090306c0b9---bizuwokurunati.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/35788996170.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/60116084793.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e3f9a752963705d4cda8abcec51ef19d/86252583999.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/vezeranekigenazo.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_off0000c60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 10756 bytes
SHA-256: 167d92e6e7873e5683556d458de280eafc8c76eb842a47710fbcca613a25a9f9
font_01_sfnt_off0000ded5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED5 17636 bytes
SHA-256: 2f7e0fc8f101b9405790c1415061cccbf63b0d25b605cdca3c95bb5d38002e1e
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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