Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca765f49df435b29…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 01:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e848a06f87c8c6409b9c0f95e131b53 SHA-1: 0d7cc7fdfa0ebd7517d8854c7fa17933aaaed2ab SHA-256: ca765f49df435b2962854a6d8c3597e769eba566952e876e03c8f61d25acc4f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with one URL specifically mentioning 'free fire download', suggesting a lure for potentially unwanted or malicious software. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vishalahospitality.com/ckfinder/userfiles/files/xijowafopo.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/89309966239.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/gozowiketerujowowulimobip.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/pitiwi.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/61123087288.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/77091805166.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/loxusazufoguluka.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/84195136636.pdfIn PDF document text
    • http://princeverma.in/uploads/files/26374238865.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210906220403_x9e291.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/pufafixudezakafodufi.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/bujisitigojeduvovi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c184a9ba6---87490234257.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/77258827482.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/46326309039.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/lokogoroxubowupufuwogu.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/mofiwofefexewatazavi.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109080814082273.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/tibogodi.pdfIn PDF document text
    • http://vo23.ru/upload/file/mobipolaw.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/vafebiwig.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/82932362926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+download+new+version+2021+apkPDF 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_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10908 bytes
SHA-256: ea4df0c06e9d1fdf2798bef5fd9c97236e12db4c6c806f0be27530e3e1dc8739
font_02_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 17532 bytes
SHA-256: e444efb37e19d200ba09a466b3e769827709e880a4550a3d9a8463675f816f3b

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