Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28ee4d1b2328050…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c378f1699930ae187657fc868171591e SHA-1: 537d194c80f8d0601f44a2bb5e0f3c8e2ad6a3b7 SHA-256: a28ee4d1b23280500c7df407f37e20dc396d418584b6bc5ca786d29bfb37ab24
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's intent is to trick the user into installing a fake browser update or extension. This likely leads to the execution of further malicious code or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://emons-verlag.com/testarea/cwsCMSlight/media/files/5839309055.pdf In PDF document text
    • http://gsemilia.it/userfiles/files/rolifitozo.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/16545470917.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/dugatudejesigixug.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/kurutekoxid.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/95152738636.pdfIn PDF document text
    • https://krusomying.com/data/file/pisiw.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/4531737139.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/13044457846.pdfIn PDF document text
    • https://andrejc.si/files/file/tuliwagefabajijojujadul.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/exesedigax.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/tewusepoboj.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/1556390734.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1753da1e5---64091036018.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/wevixutororinoxin.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/totobi.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/monuxepixel.pdfIn PDF document text
    • https://il-gusto.com/images/file/70783964156.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/bewifewixojufebaxodalenox.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/a858e216749ef4acb783428a8439feb2/53291490274.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/71098436954.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/nanafazabepej.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/18939446357.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/22413607337.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/68383179776.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/vixinobu.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/parama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=wattpad+old+version+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_off0000d98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 17200 bytes
SHA-256: 280667487e424a7f4cc6c76ba8326646a8a4eabec16b1b870d9157af5dfa793c
font_02_sfnt_off00011e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2E 10444 bytes
SHA-256: 3423b0a150315ed77cda60f15630cb739f5651142263c63214473dd333bc2aee