Malicious PDF — malware analysis report

Static analysis result for SHA-256 e133a5ecfd7bd7eb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 05:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df818e982e1ba85cdbf3328c016ce95d SHA-1: 953ce60261e51598db398d875bbbc91d6b7c6254 SHA-256: e133a5ecfd7bd7eb297f654989c00c380d0bf8208ea5d7d894498000d0c8edf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=rbxoffers+new+codes PDF link annotation
    • https://skatrip.com/basefile/skatripcom/files/54746764088.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/dudofetoruzudopexed.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/249ef2859e8c4e87913ee79df607299b/fewusafekam.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/33114826923.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/40527127130.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gatojomikifuvemubu.pdfIn PDF document text
    • https://fond.ru/userfiles/file/30146166387.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/voresajudodeweb.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/rerowixijute.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/11822229329.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/85411375269.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/27894723037.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/1197979657.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/77248437825.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/zemoraxite.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/94573559436.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144939645ab2---53228175163.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/givutazuz.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/pefufifipuselabudox.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901062149930886.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/xasonodazipovu.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/66521808866.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/18097282616.pdfIn PDF document text
    • 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 17708 bytes
SHA-256: dc0ea0d47d6ef9748dd824d81d0a4a37dcb0009f5330d69972e8a8ac00e996ba
font_02_sfnt_off00011b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B13 10444 bytes
SHA-256: 6262162588c558807e7d1b6779f6d6edebfdbf13d7a1f7386b6c0b9931f2fe8f

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