Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b800b8636046436…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 05:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1552655811f018aaca470e90a3e8c8a1 SHA-1: 8c4a334ce8ee886933c9a279eff4e508594379e8 SHA-256: 6b800b86360464364f4aa90f43d8cd3aa2a4985b4fd9568c0fcf39dd1da2b848
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external URIs, many of which point to disposable hosting and are part of a link farm designed to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136d60f3bb12---nilewu.pdf In PDF document text
    • http://onestep-tokyo.com/userfiles/file/xuwinasisagaporenejase.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/kusorezujiveli.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/45278684518.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/41209569928.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/livebukiwizajefatum.pdfIn PDF document text
    • http://12shio5.com/contents/files/52653455203.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/duxemosulakabawuxajorijo.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/jojufolijajulono.pdfPDF link annotation
    • http://magic-mugs-factory.com/uploadfile/files/55809132276.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/kitarisonet.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/78369834027.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/favivop.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/93737343464.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/fufadux.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/23895386906.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d835aaa168---potowokuxop.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/jixipowevisepuwisa.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/newevopevavosafozozar.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/41350911936.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/60818225897.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/51202606842.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/noxapejekigevexupiwu.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/88686688011.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/97648171711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+stop+vibrate+text+message+androidPDF 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_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 11072 bytes
SHA-256: 3f4cd971e810bee5ea321b0ae562b43bad5602b17f2b4c25272de6b034e689d9
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 17860 bytes
SHA-256: 7682f226898bb0a8fe1bd10a1fde173fcef40dbef3be82decadc1e4758c865d9

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