Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd43d0105720c85…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b7ee8b9ff91371fbcd71c2b6055cdcf SHA-1: 67e383a5440d2fcce503449e2f848946fda429f9 SHA-256: ccd43d0105720c8579272a8f7b33977613388f6660753eeebc003eb674dfa25f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host a large number of links, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rolcsi-bau.hu/userfiles/files/kanimokosonunemuk.pdf In PDF document text
    • http://letresorellebio.it/userfiles/files/85521041049.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/danupefimenewebokezofazi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/83862317133.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/32103736496.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/92052753294.pdfIn PDF document text
    • http://gaudi.tw/upload/file/78584484040.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kebura.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914090943_141057004.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/50957063482.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/53185760217.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ravuvaliviwexadiwav.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7e8aecc15---45031284172.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/39848729738.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wemagilolenukalerukod.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nokane.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130d22d28848---66351542651.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/77802119138.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/berujuda.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16147d75ff1a73---56600899072.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/10869190321.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/8099272640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=install+hbo+goPDF 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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 18472 bytes
SHA-256: ae458710bcf45ccbfd52f92c0bf1cb1f6305587ebac568a0190d50b88c5ef57c
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10156 bytes
SHA-256: 3a6f9de7f1fe44719cd18c9693ccea69296cca37e61ef29af8cf8552d1642a99

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