Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6c367a1a51a0f4…

MALICIOUS

PDF

204.0 KB Created: 2021-09-16 05:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c857d1a5a879ab736b5a1d1a194a80e SHA-1: 73bc03a904fb16f497cacc32fb42a25384bac54c SHA-256: 7c6c367a1a51a0f4970932431896c1b9e4785e6456e4554790a0d3559f8af9fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to other PDF files, suggesting a phishing or redirection scheme. ClamAV detected it as Pdf.Phishing.Trojan, and a machine learning classifier also flagged it as malicious. The presence of embedded URLs and the overall detection indicate a phishing attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dblbtech.com/userfiles/file/kudib.pdf In PDF document text
    • https://komunalno.vrgorac.hr/files/31568057791.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/bitosuwakiguwefakirila.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/78262629629.pdfIn PDF document text
    • http://aurora-c.jp/files/files/zepitabibelujiviza.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xivaxisusipe.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/rabisepelerit.pdfIn PDF document text
    • http://langyupharm.com/upload/files/21630053259.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613031e314628---rodeganasolawejotifixapam.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/82929673083.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/42798479524.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134543d98c16---dopajudozito.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/jotaguzafakigaluk.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210911_75B9B4F7E77441FD.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/merogir.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/13022640546.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/livojeda.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/xuposeruvibisuzoso.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/71865378790.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/fudovizake.pdfIn PDF document text
    • https://digireg.pl/upload/gowexekumuwirowavi.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/solinukamaxulekefu.pdfIn PDF document text
    • http://fittbikese.hu/files/file/11786524806.pdfIn PDF document text
    • http://104408017.linker.tw/files/6874348249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ringtone+miui+12PDF 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_off0002bc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BC83 10292 bytes
SHA-256: bda1ff7f8e7a8eac8c080cdea4077d9467c24a6bbba01278ac3553df9390e5dd
font_01_sfnt_off0002d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D3B8 20508 bytes
SHA-256: 5d2436eb4012ca571065874df673fbec056f16ab5bc974f6806f402c687bbabc
font_02_sfnt_off000309f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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