Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4502e7ac92fd7f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-13 02:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd5f429fcd7d753e3b527c2739ca8906 SHA-1: 031c294e10880e5bf73d2824edb000d689aad4d9 SHA-256: be4502e7ac92fd7f94b0f3b1173d48ef69ff2a187210a837886323d383562c8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the suspicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://status-go.net/gfx/userfiles/files/wipigibibowelemiwabo.pdf In PDF document text
    • http://partnercable.com/files/75808779625.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pqdmn2sj83pfo1cevqm1m873d9/magepabovinalim.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908062912.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/wujazav.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/51687558479.pdfIn PDF document text
    • http://acril.ru/ufiles/files/14226226451.pdfIn PDF document text
    • http://unibox.lv/files/text/36947611697.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/75496968326.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332e0a1015f---mesuma.pdfIn PDF document text
    • http://sswjeans.com/files/65324171466.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/rerunazozegunerex.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/fugoteruj.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/93404371838.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/raxanenotivegorugux.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/55626119302.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/29681991992.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/28680110259.pdfIn PDF document text
    • https://harom.ro/files/file/tujunug.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/kibesapeludufomozixoj.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/57282623602.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/10508505495.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109070119405012.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/66999374567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=chapter+5+chemical+reactions+worksheet+answersPDF 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_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 16716 bytes
SHA-256: fe6a09ed21862585f30132c08ba3c288ec7210dc1370ae8a5a066d1df1e95cb9
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 10980 bytes
SHA-256: 7b921f919ae5c9a37f7527746780e8afc11ba7f9eabdf166b257063aff31069d

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