Malicious PDF — malware analysis report

Static analysis result for SHA-256 7196228c25cf995b…

MALICIOUS

PDF

83.8 KB Created: 2021-10-09 12:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: acf33b8ea021b42bfe97bbb3f5093a56 SHA-1: 4388358007516112135517c3f298d7ebc47ec25a SHA-256: 7196228c25cf995b97b47dd0592e8ab80937fcccc1e686703be94c7392b1085f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attack pattern designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=beta+meaning+investing PDF link annotation
    • http://sumbulefendiegitimvakfi.com/resimler/files/62897340716.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/loberijuw.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/vagobo.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/rumamajamunasalexi.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/vekunikep.pdfIn PDF document text
    • https://coil.hk/upload/files/71590141291.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/80592374916.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/62152004613.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/19103564093.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/79326872391.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/duxozureloro.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d7a3cf72---mamofilezamawo.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/gisewerapawuramijemideji.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/laxeralidutemexapataworu.pdfIn PDF document text
    • https://termoformat.md/img/files/jirufiwupet.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/vikosu.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/vupuz.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/15658607073.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5d8222bf4---xuzanugapomipinuso.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/46515799491.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/kenub.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021092215203973499.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/petoxal.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/67568600304.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/gogivupajo.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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 18916 bytes
SHA-256: d6e19f2bbeb9eceb69df68547b1956dd091cae447445c621ca79e37fb4a0d809
font_01_sfnt_off00011225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 10304 bytes
SHA-256: 8e09deaa1af57def01b3aa3340fcd316fce04d8d7030949041f8d5bda5392cd2