Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc64d048239bc12e…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 04:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 588df4b7287c175ea7f089daf4cbc10f SHA-1: 485b8c0313783a1fa3a170f24f7406a70c4cd5e9 SHA-256: bc64d048239bc12edbe864fe5fb8e2f321c13919e097847068dedd13e9eb6d23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ybshajiang.com/userfiles/file/2021-09-03/210903135600557736do3pgnczwkjx.pdf In PDF document text
    • http://greenworx.eu/images/uploads/files/48749432631.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130391c3f40d---jaxixoxadulapadi.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wagasejomujotizorupir.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wodulejerisudaga.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/demudidete.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/10943119331.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/73956389805.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/55005633887.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/56284162265.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/69209467581.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/xutigesefefolixarogu.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/mefodek.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pelotizuf.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/81vipgodqp20h1ofb50pcl65q0/vekirevizot.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64740921175.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/mitewajefimekidufavimogu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pufugova.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/27852667177.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/21784188570.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/57182351089.pdfIn PDF document text
    • http://carbonelite.ru/file/44178831407.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/burevakume.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/nidatikaralu.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/8505795426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=sound+driver+for+windows+xp+32+bit+free+downloadPDF 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 11352 bytes
SHA-256: ff7519bc03093639bf9d0964eb8b1e6e9edb99068f5659b023d5bb8cf06bdba7
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 17652 bytes
SHA-256: f2bb534e326d4fc19366d6ad1503779a88979f8c8ff9efc475caa4153002d29b
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1