Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae66c1f740b3b88…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 13:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85bd8442e0d43bc44620acf93cb46ed7 SHA-1: 1cda6a3ea17f40040a252efdef8437c9273df21b SHA-256: aae66c1f740b3b88b6e2994fb9f939b38c6dae75e380c6c565b588d2119ae29c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many of which are linked to disposable hosting and employ UTM parameters, suggests a phishing or redirection campaign. The heuristics 'SE_URGENCY_LURE' and 'SE_INVOICE_LURE' indicate the document's content is designed to trick the user into clicking a malicious link, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=sun+tv+apk PDF link annotation
    • http://dblbtech.com/userfiles/file/28688831073.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/84403166557.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/bezupilavejug.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/zuvotuv.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/kazamojigutafudases.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wumuxekevutinipigajigogo.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/ferunibutemeraxeg.pdfIn PDF document text
    • http://soles2walk.cz/data/file/18719373222.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nojudugaginusuxederaboxi.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/62617963296.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/bupilofupedifimi.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/dizumuforituda.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/80250405534.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/82250474468.pdfIn PDF document text
    • https://12shio2.com/contents/files/30925258459.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/20054353908.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/makana.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/84323029525.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/kidoleworurowuxutilufubul.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631433875.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb6914396---13780624659.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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 9920 bytes
SHA-256: 05dc07fae1b2402964ae3b9b44538d287f080d7f0f29448e5f34c3597a3ee4c5
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 18660 bytes
SHA-256: 838664bb42f981a4293372db73bbe0ad55249fddfc5a6fb9804aaf2f34aa2a70
font_02_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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