Malicious PDF — malware analysis report

Static analysis result for SHA-256 507c0f5fbfb862f7…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 02:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5eb0fcb9270f6cfe7a244b5e82f7f2c SHA-1: 7ae11e39c131781d90788d6a51aa26f1f7fb98a8 SHA-256: 507c0f5fbfb862f7c884295760c469ff778d2f6a11ea251bbe6860cdc19e8d14
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content or download a payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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 http://emilygrilltogo.com/uploads/files/wakodeweje.pdf In PDF document text
    • http://rzn-house.ru/upload/file/jilipojitumufibi.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/rusakobepagajifolid.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/4041941597.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tonapezovorokomuporilun.pdfIn PDF document text
    • https://grandegroup.net/files/darixosumitar.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/bevesaxik.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/37377176648.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/45726979218.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/33442474156.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/49433516940.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/zisurejovabupebuz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/452587ee0c3b7aa2541259102639afd2/noboxi.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/61840192033.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-09/images/files/durovonejegoxomekomag.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/wemipeporifagizufudifevi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/jumizuxodosata.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/14471293704.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/49295841986.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/71534149793.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/24695904130.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/zimoxoxulukip.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/relugevorit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pokemon+fire+red+randomizer+gba+rom+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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 10812 bytes
SHA-256: 2f54dab27a258d8ca47b16722d1c74bac4c5637effd83d28a76849055c6c378b
font_02_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 19192 bytes
SHA-256: 911d9f4c6c2a4d7e1715acc30d822c540002e04518a4c3585f6774e2169f315f