Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf43e5421970e061…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 06:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b48cd80121fc259912d8787bde9a179a SHA-1: 66e28d42753d4cdaf379973c6a91693d2353b954 SHA-256: bf43e5421970e061dde2dcabf13a6143c27ea91780942975d79c5f0ede324067
86 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this behavior. The ML classifier also flagged the PDF as malicious with high confidence. The presence of an IP address literal in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=best+offline+android+games+with+controller+support PDF link annotation
    • http://ugyvednok.hu/userfiles/file/90649063531.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/39930690695.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gaxikuduta.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/94542206596.pdfPDF link annotation
    • https://euro-m.si/web/dokumenti/file/63847450650.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/64767044923.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rixazujurarolisugexin.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/54858769952.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/17814986664.pdfIn PDF document text
    • http://net-work.cz/data/file/giwarixewitadabavinukipak.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/1d1c4f0861fadae65f12cdc40be32f00.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/14144798253.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a025ae6df1---lililumeda.pdfIn PDF document text
    • http://geodez.com/pliki/file/36119200071.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/radamewinu.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/bisifatigawu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/bipuzojekobewe.pdfIn PDF document text
    • http://inphilong.com/upload/files/971075249.pdfIn PDF document text
    • https://atiksigorta.com/files/35898642834.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/82646982940.pdfIn PDF document text
    • https://eclearusa.com/images/file/nanawezasifasa.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 16912 bytes
SHA-256: 667c0f96d5bf09338f74efee4d3237a266fe3576bffbc90095216b6dac3e4306
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 11304 bytes
SHA-256: 36a785432be7aaff64a28d00b824b987aa724496bb259511efd461d09bdf3afc
font_02_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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