Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f26044144ade96…

MALICIOUS

PDF

68.4 KB Created: 2021-09-16 23:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6bcdcdb79f2a0f6fb53d110ef340484 SHA-1: a8a7a9ea90bfa9d16d48a5f73de0ea706dd00e8f SHA-256: 55f26044144ade9669e45698c2b66333bff8652c9af3699085ea6f4a1594b2e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs pointing to potentially disposable domains, as highlighted by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, strongly suggests a phishing or malware distribution scheme. The document body was unreadable, but the overall structure and heuristic firings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxifavasoluxofifejade.pdf In PDF document text
    • http://ed-web.cz/userfilesfile/11755419334.pdfIn PDF document text
    • http://cartopack.com/Images/file/99777716139.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/82857484909.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/fepofipineziwezexatope.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/rutunuturuxovebonefitula.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/56457189661.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/18434379251.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/51843522476.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ligadorosanaga.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161390681b0291---5806259572.pdfIn PDF document text
    • http://ranch.pl/files/file/pubojibetolaji.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/42172317547.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/mudegijevokagezitexi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3cb4c195a---peruvavililokaruvu.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/funasefix.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/1100469977.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/dujiteguxago.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/66118148473.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/52417029441.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/nawopubev.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/54874905157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sending+resume+email+to+recruiterPDF 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_off0000ae74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE74 10888 bytes
SHA-256: cb3cfeab644351c67382927de3a24f209f7e7acb5a5781c481ac470354b156c4
font_01_sfnt_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 14724 bytes
SHA-256: cde3f04ed26b5af771070a7fd64f78971c1ba276a2a11e6e77c57f5bbb20e2aa

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