Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2c2b640e7b0128…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 05:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e47c2fb2667dcb6c6bd49ecd62df45e8 SHA-1: 47a56106d2823cff31a53c53d335bb407464099e SHA-256: ca2c2b640e7b0128ab3281358304c0009ee64b86a754cc14867e854a89fa8e2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains hosting other PDF files, indicating a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://litho-and-co.fr/ckeditor/upload/files/zeridofuxarilipokik.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/14275533066.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/gefogilokuweviniritifafes.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/77990479283.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/98654332143.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tasoluf.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/tapukiwekixozakemazejuk.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/veridadoxajanuloni.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/99798880044.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/71503101991.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/patunejime.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/96069305970.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/37218282188.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/91372232182.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/dizepeb.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/doximagoso.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/nimukitodutuvum.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/28635086332.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132df372c169---75843236366.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/08bab4b917e5e5892a4d6b4ff8f765d1/roxunakuk.pdfIn PDF document text
    • http://ebus.cn/up_file/file/fevubugumodixubipete.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/luwibuvujalakigimolidip.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/38823788505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hinge+dating+site+apk+downloadPDF 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_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 10636 bytes
SHA-256: 56fb69704103cafbf6c513f0f711fda964099acf5f2ac25d28372ed4011f355e
font_02_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 18344 bytes
SHA-256: d976387ac3a9b33998e6871ac7a3a0d7026ab032921dc2f36b21b7e26a1fda13

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