Malicious PDF — malware analysis report

Static analysis result for SHA-256 93511f947f330583…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 13:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7f6547cecd6a1f279c0ab55f7551a167 SHA-1: a08fe6b7067b582e4a97e67186f0af9ecf034cb7 SHA-256: 93511f947f33058351c233e0513d6b7ebf9114fcd24cb6691c091eeebf982318
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure the true destination or distribute content across many domains. While no scripts were explicitly extracted, the PDF structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://phuquiland.com/upload/files/tekalakinefizulefubivul.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/81c09735ec6d1c00ffc7728072641844/noxawazijopa.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/pivareresebani.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/wifujitaguporoma.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/jejiraburebotivep.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/44506870326.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/ketafijasebe.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/xopovejumomuxagatu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a2e36c2f0---jipotawamik.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41319040062.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/witipejupogonoguxor.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/pikopuwanulolefukasemow.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/27559327375.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/56443261466.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/fumodasad.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901202358511531.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/tewigu.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/16582598501.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/72470191912.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/35955805466.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/povatosaguxetotafofarum.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/bivevinuzabininegeweru.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/56156535537.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/dodikino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=swords+and+sandals+medieval+mod+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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 17660 bytes
SHA-256: e590061979f95b16200f3ec9ef966ab581d3caacf31304816be7d7452feecc6f
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 10772 bytes
SHA-256: 5a27863bc97cbd07f5a50c9939c52906265fd2866147b681bce20bcdcc208d1f
font_02_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1