Malicious PDF — malware analysis report

Static analysis result for SHA-256 e980bca6fdc9042b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-24 04:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd498c6d9c73a54ec8581e5dfd4be44d SHA-1: 5cf5e89d3a9081d365b1db12d4d45e60147db4f3 SHA-256: e980bca6fdc9042b06d225c676d1e1b07426fe95916f8dc9dd4e1cfacae302dc
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing a malicious browser extension or update. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=ben+ten+cosmic+destruction+apk PDF link annotation
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/mapowekebalusuv.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/66911787851.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142026c8875d---liwugebuvojatem.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/85528837732.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/barupemujolukexap.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/dikimijeragen.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/fozupoxesu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/35728003678.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210918034856.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/tinigifetiz.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/nepejulitiwedomadibukef.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/25205251498.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/48581582545.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091606013490.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/99565178935.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144833c65d12---fupuwatogufosi.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/34183672278.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/96511947724.pdfIn PDF document text
    • http://shesob.com/file/files/tibakugudometuvij.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/jevosevim.pdfIn PDF document text
    • https://bawauang.com/contents/files/jatepetutonipilo.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/4922649834.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/belepexizikopasab.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/5540071903.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/95082033645.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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 17980 bytes
SHA-256: 6339a749ecddf500d41491a37e9e77f488ed8b400084292a523d14f3f739e715
font_01_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 10872 bytes
SHA-256: 0019144a489751a2ea8d02032ff9cc2df5342a17631747cf1bdf939f57d698ff