Malicious PDF — malware analysis report

Static analysis result for SHA-256 92aa77cdeaeb5364…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 13:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7522bcfdbbb1f786d357dbb17d725f8d SHA-1: 396b7b7738ba1c334c14a1d0df5beb0a2ef7a5f4 SHA-256: 92aa77cdeaeb53640da9a7ae3a7d6667509d9563aa71f3b84a9c3d5c7ad16431
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous external URLs, including one identified as a potential redirector, suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/wixifodorokuke.pdf In PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/50738433184.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/11262814934.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f849399ba6a0ba09aa55f33000d6a5d9/sezukabubuxogomuzidojikod.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/11889870263.pdfIn PDF document text
    • https://theipbuzz.com/images/file/tafiwitupaxejiveresanidi.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109120713246941.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e37432315f2708927820ba19dcb63421/1068188251.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/21884947781.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/ruborefulobobefadariz.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/19671592497.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/94517750993.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/65775145631.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/gubikolitexi.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090432459673.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/14719624036.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/puvifodekaxoj.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/46031453612.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/vivolepanajotujovedigi.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/71379222224.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosafovumugotobizomesiru.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/fipatepumuvorole.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/palovi.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vupaxatalinapupufe.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/xuzajometobekizuzifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=spy+mouse+hd+apkPDF 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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 20412 bytes
SHA-256: 17447f417254852000717f6c11cae011ca910629e654cf40c58a8bf251081fe8
font_02_sfnt_off00012a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 10600 bytes
SHA-256: e34e73f56e930b2b6975338cff919e52c5923f2d73e272164ff71402fb4426b8