Malicious PDF — malware analysis report

Static analysis result for SHA-256 7330d4149711842e…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 01:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbfc5d1add980325ffcab6ed2fc776f0 SHA-1: dc6aff202c9f9e7ac852eed3de18e1a4f9de4e6b SHA-256: 7330d4149711842e0adf9e76f70e0a3a8a3f86c8c504d0607f17588c0e13f49a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious files, indicative of a phishing or malware distribution scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent. While no scripts were directly extracted, the structure and numerous external links point towards a phishing attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://insfilings.com/skyzone_classic/upload/files/jodesusifepaxi.pdf In PDF document text
    • http://natpuedu.in/userfiles/file/53543256419.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/miveb.pdfIn PDF document text
    • http://trubaopt.ru/content/file/11857728662.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161323cfd4d860---5078168358.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/41623000589.pdfIn PDF document text
    • http://elma1.ru/!upload/files/33057354183.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/pojumosuruno.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/padizetixujad.pdfIn PDF document text
    • http://labsshop.com/d/files/18461595908.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/81365770777.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/67477928528.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/gunogoposetuxubor.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bokofizabunizoloj.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/72445838444.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910045645_udgo8z.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/rijewajavebajuzunig.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/5954472773.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910032706.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/xukufijuniwalejibekit.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/96379095309.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/3608463495.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/78458090511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pato+tv+2+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_off0000d33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 18004 bytes
SHA-256: dfbabd76d5cf00c406b3bc288026f0733ffdbf879a1de4ec03c9d81e112b9d83
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 9884 bytes
SHA-256: 2147d4f245afe6e389cb79a6c50db30e0cf088d2c1fbfbdbe4e2033a1c484cab

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