Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec066f94088e41c7…

MALICIOUS

PDF

78.0 KB Created: 2021-10-10 11:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f329fed8b5c887ff78c0a2d2c1083d25 SHA-1: 1f93b8ca97f1e8b81281e2a8ef6c95b3b792e71f SHA-256: ec066f94088e41c770a6384f2bd5cfeeffb0e4f6ed347178c0c46073bbb75bc4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=happy+sunday+hd+images PDF link annotation
    • http://vagtteam.com/userfiles/Files/bulerawisisurazodel.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-15/20210915144505859275.pdfIn PDF document text
    • https://netlandschool.cl/files/37831932787.pdfIn PDF document text
    • http://odumakus.com/uploads/files/wonexizapodaniv.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/96256934574.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/33051199368.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/28911702137.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/674905788.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/seroxumak.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/sakiganugivar.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/18362399541.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/golozozilutosatenenewev.pdfIn PDF document text
    • https://bnovum.hu/downloads/fewezaneb.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109181714321110.pdfIn PDF document text
    • http://clingac.com/d/files/10358131870.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fiziderosonedipigiwanume.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/22066361792.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/41200926444.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/80517695040.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/kafidirapekavotenexutig.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kotezuxosuwefoduru.pdfIn PDF document text
    • http://yjccnc.com/upload/files/lasakinavexavenupipufa.pdfIn PDF document text
    • http://93564497.com/userfiles/90682393817.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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 18596 bytes
SHA-256: a5849713b3e424214004f0c73096eddaedcb39afe127751e415c2ffaf0edf3da
font_02_sfnt_off000112e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E6 10680 bytes
SHA-256: e8eb9799e85843e3f2a3251ca3d73d15b210bc742b7a0724c9c88c93dc85092d

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