Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba7de854137bed8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 21:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 426e8957577a59cc76b1f8e1473135b8 SHA-1: 65391f64181316d5b9f3a0806a4b85b469d246fa SHA-256: 8ba7de854137bed8510377b805502904131c9b05e021bb17455715e77e4587c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the links, and the ML_NYX_PDF_MALICIOUS score is very high. No scripts were extracted, but the overall structure and URL distribution strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://garglob.ru/uplcv?utm_term=text+to+imessage+from+android PDF link annotation
    • https://europartner2.pl/uploads/losojo.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/7198071011.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/vaxini.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/69627985180.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/nuwitusokelo.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/novaluvugusixanotixixefo.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/58797690828.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161349ce01585b---24138890795.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/nukufurezaxokesolus.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/bemadisezajonaduwap.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/lodorozuvaponesupu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/fb7aef958c2e6d5a16aa9fbea52e9c6b/furaxewo.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vusoxesagaroruvodomegex.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/13305486236.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/97630335724.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/56677628487.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/42051457301.pdfIn PDF document text
    • https://ratodua.com/contents/files/49827372729.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/nunabotavuwusotaloz.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/kawiroziwodariwok.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/28640891779.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/53491708283.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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10716 bytes
SHA-256: f159f6627640f37b1c39f836b07702c238442958f1b27d03802cc2247ad592fd
font_02_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 17020 bytes
SHA-256: 2830998178ee9851ed3ee52b52782705187e430a68169469608f200837bc1c7e

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