Malicious PDF — malware analysis report

Static analysis result for SHA-256 9512b314dc62db19…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 09:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12130a1c122b87cd0f2496c864ffaba0 SHA-1: 013681c08f79cbac454adf3db672458f1126c278 SHA-256: 9512b314dc62db195aae62cc7660962debff0cb9e4f3cbc4195e60a25fb69af5
134 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. It contains numerous embedded URLs and a heuristic indicating it's a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=loudtronix+free+me+music+downloader PDF link annotation
    • http://www.sanjuktabanerjee.com/fckimages/file/xodivodonubigutuwegali.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/mujakexu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/dodibalejazivuwaveposej.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/28024282852.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/xerudewawagaxibexaxotas.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/40731353467.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/85563331954.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/mimapekexolezago.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/60082466586.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161482c2561d4f---37127933666.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/kotexevuwajokovuze.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/rurosijixilu.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/lifamek.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/jamusexosove.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/fotazikesux.pdfIn PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/7847577688.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/timokor.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/59174853114.pdfIn PDF document text
    • https://angkalaris.com/contents/files/pazuruki.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/25100092407.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/vakivejusiz.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/84472455167.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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 17600 bytes
SHA-256: 3ec54c9656ec7f4561b0d26c5878408fb34c2e73c236fd81e47fea71140b2be7
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10880 bytes
SHA-256: 4a282765be1b3e9ffa6f1d9aa6a8cb3c65bc7b1e710c20abb15411092e397083
font_02_sfnt_off00011c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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