Malicious PDF — malware analysis report

Static analysis result for SHA-256 21019e4a01c6d62e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 07:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 367fcc6ffb40fefd9ffee4b1fe00109c SHA-1: cea442d24c6a6d34fa9de10a26a3442bd6984ea4 SHA-256: 21019e4a01c6d62ef24c336bcd00155363f0b5c3fd1981c33c72c2f1c36d0c2b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ClamAV detection, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=hoga+toga+lock+screen+time PDF link annotation
    • http://ieltsadd.ir/cache/fck_files/file/siluwo.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/darakenapiparubajizur.pdfPDF link annotation
    • https://indicaperu.com/userfiles/file/ketorexikesosuzezujev.pdfIn PDF document text
    • https://guijek.com/userfiles/file/55929919910.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33938272189.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109100420163408.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/kevugudevegi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/wuvalus.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/67122506028.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/71370559677.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/datokamojewoxepadirebem.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/mobok.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/zeniloxevikuvaki.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/7692901746.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/jomifubodivefolawu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/3abcadf71b9255d4996384bf55d5c49f/43236864024.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/jatabosazexel.pdfIn PDF document text
    • http://bwc.lt/i/35621028476.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613179d8ccea7---66481711966.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/92930109088.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/gukojofetorinopasidot.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/bulizaweralusupato.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_off0000d5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 10656 bytes
SHA-256: 4df2ae939de359fa58bf4b8e5fff62f25eb4f98a5c6ee18f52fa4024748b2cd1
font_01_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 17692 bytes
SHA-256: 293f48a19a1e41c278beb36d5203f45e77c45ff4c5fe0e9990f37cf5c4d7d3cf