Malicious PDF — malware analysis report

Static analysis result for SHA-256 b842d6e7aeeb0eb7…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 14:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b618a6e3af06c895016824c2fa36fe8c SHA-1: 3af916eb327bf16527ceb1e5050eb01d88098767 SHA-256: b842d6e7aeeb0eb7e390df1220788059825caed3df2dd8f3e06d3120864c5e25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, many pointing to potentially compromised websites, further supports a phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161301d1f769b1---49509920797.pdf In PDF document text
    • http://hzaidele.com/images/upload/File/39111624543.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/62180890106.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/42300705455.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/jitonawalavu.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/21559812910.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/84126885569.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/88771081417.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/jebefesalip.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/budomemobisoforuvutusan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612febb11f8dd---20158402870.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///28415407897.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/73687444946.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/weporubo.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/15065505911.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/22016501839.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/92267577425.pdfIn PDF document text
    • http://hanleyresources.com/images/bolenewalaw.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/83320230346.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163148627323848929829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=blade+runner+2049+torrent+ytsPDF 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_off0000bad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 18320 bytes
SHA-256: 876af994cc399effb1591921017aa01b85bbbc409d3aed61e419a3a36cdc2756
font_02_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10904 bytes
SHA-256: 8773486bd77a82df733a14d8747ec13517965b07de918209397aa102db18d81b

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