Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48c41a98a6b471b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 06:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ea0328754693a34d1c53239228076de4 SHA-1: 5f3159d117408a9f75fa9ae4386e55b4e7f48826 SHA-256: a48c41a98a6b471b701e9737957ea2f887b054f6fc4d6cc77e6b153baa17b9bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to potentially disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://maraulsan.com/ckfinder/userfiles/files/terexevewamujezuxidoboxar.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/148c14a6f3d51e8006270480e97919a5/94128217546.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/14637144746.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/kugavefenaz.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/92584840019.pdfIn PDF document text
    • https://ags-car.com/upload/files/82148635005.pdfIn PDF document text
    • http://kasargod.net/uploads/file/29217880707.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/xizebesajenaremas.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/88782303318.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rijidutuko.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/75366207790.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/18793092607.pdfIn PDF document text
    • http://lactopad.com/uploads/files/damoju.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/laxurel.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/98753501886.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/54713048562.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/58488913400.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/benavinurafurel.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/32982806461.pdfIn PDF document text
    • https://reniuved.it/file/24942133208.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/pevod.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137294b8bb98---mumafosezatimewaz.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/7788024692.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/51981297060.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/73561706567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=grand+theft+auto+3+codesPDF 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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 10748 bytes
SHA-256: b875b5c0ddabb648cf1434d34b98a0241c8f8f55627545b923f7d70702067514
font_02_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 17068 bytes
SHA-256: 0ed2d11ff70ff3588814bcfae1d5569d4454ab737e6b7fb40dcb0417b2e960cb

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