Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12e7a211327af93…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 01:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8af21091a68727ba24cfdda50943778f SHA-1: 5f2de6c4d956bc1f4fa375d39482f918370fc120 SHA-256: c12e7a211327af93bf1f4227aa5a229adae81e0c43945dc52e34f6d871a47f89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the nature of the embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://garglob.ru/uplcv?utm_term=send+from+phone+to+pc
    • https://htapigroup3.com/contents/files/nusufisasozopabakudidubu.pdf
    • http://tw-jia.com/uploads/files/202109181107274349.pdf
    • https://webmanagement.jbclub.ro/images/file/dekanemoxuketunigaxuxowu.pdf
    • http://vitalchurchesinstitute.com/files/file/kiruxijudaduzapa.pdf
    • http://moderna.technology/fckeditor/editor/filemanager/img.php?file=file/lirasofile.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/1411033381.pdf
    • https://akgoz.zemta.com/uploads/files/ridefosoxonol.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139db08bb881---4266273058.pdf
    • https://akvanova.ru/sites/default/files/14122123372.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/62798334901.pdf
    • http://www.aragonemprendedor.com/userfiles/files/14552573471.pdf
    • https://liur-krd.ru/userfiles/file/48417181611.pdf
    • http://leylatoprak.com/userfiles/file/libanezabim.pdf
    • http://dispensapertutti.com/userfiles/files/tuloguxavamowe.pdf
    • https://eniedu.com/data/file/20210922023806.pdf
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/73849814321.pdf
    • http://movietek.vn/hinh-anh/files/19135624230.pdf
    • https://zweefvlieg.net/userfiles/file/dukiditaput.pdf
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/85471035331.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/30418969184.pdf
    • http://studiodugnani.it/userfiles/files/15422889848.pdf
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/23165083905.pdf
    • 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_off0000adee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADEE 16792 bytes
font_01_sfnt_off0000c600.bin
cf89f21fdc5bc69991af9b568edc389666b1e787ad1c4e9286b0bbe4d37a6b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC600 17040 bytes
font_02_sfnt_off0000f1d4.bin
477d55f23fc9d1cc603a865feecfa752232f9759e4f8039081bb195a9db4e3a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D4 10492 bytes

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