Malicious PDF — malware analysis report

Static analysis result for SHA-256 27317a6859218b8a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 17:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d42a1391d1a15f8ad08ee5492a87fb31 SHA-1: 6c0c368d8a04b1cc4679d4ef9da77d3cbca00907 SHA-256: 27317a6859218b8a67df4ac7a8382d420c1894916e2080a19b1fefe89e434de5
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many associated with link farms and disposable hosting, suggests the document is designed to redirect users to malicious sites or initiate downloads. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the idea that the document employs a deceptive call-to-action to trick users into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=roots+book+pdf
    • https://lose-weight.tw/upload/files/powotugefubonug.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/36660477398.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/rasedanozivozasomipojus.pdf
    • https://brs.jo/userfiles/files/lofuwagerisawakonomu.pdf
    • http://101eyewear.com/luutru/files/vusimazide.pdf
    • http://custom-mugs-factory.com/uploadfile/files/domikilexeberewixem.pdf
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/82018853724.pdf
    • http://falconltd.pl/cache/file/ribetaje.pdf
    • http://sun-apartments.pl/data/pages/fexesokur.pdf
    • https://bdprescription.com/ci/userfiles/files/30687377225.pdf
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pavugabuwanadojonam.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/8518647437.pdf
    • http://coeb.eu/userfiles/files/14600342375.pdf
    • http://botosani.ro/img/uploads/file/93480777590.pdf
    • http://budaors.varosom.hu/userfiles/files/ravotosowepakexumowogameg.pdf
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/73313726640.pdf
    • http://snieznik.pl/userfiles/file/97698090985.pdf
    • http://yuqiaohome.com/uploads/files/202109032301192436.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/wojinozorero.pdf
    • http://thebookmarkcafe.com/uploads/files/sejuzaxizubotokidigebepum.pdf
    • http://vasset.bg/userfiles/file/16072244176.pdf
    • http://barahi.com/assets/userfiles/files/wilozamarotenej.pdf
    • http://www.sport-konyv.hu/userfiles/file/93856971370.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bed4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBED4 16792 bytes
font_01_sfnt_off0000d6e6.bin
293562f90ec4ea80755cc5b33689df4d5f790c1d6b995f72ca9e542b2a3a857d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 16924 bytes
font_02_sfnt_off000102c5.bin
e76fffb6cde1a5b4dd039f162f789f0379d92a380f6e90722620a05337578b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10132 bytes

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