Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bad95167bd6cc7…

MALICIOUS

PDF

91.8 KB Created: 2021-09-12 07:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7061c3061b1d7f76731e50e762139a56 SHA-1: a78c1166170e3b3fcdba6158a970849a77b737e4 SHA-256: 99bad95167bd6cc711ba5fe24b5bf1c0dfef7c7293f2b281679f37bad2cebfe9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to redirect users to a large number of other PDFs hosted on disposable domains, likely for SEO manipulation or to serve as a distribution point for further malware. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the link farm heuristic point towards a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://zgkimsteszew.pl/img/upload/files/26510944906.pdf In PDF document text
    • https://autoroman-service.ro/imagini_ws/jezusapu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2euu48q3vnd7m7bmneb50cmivs/55829967455.pdfIn PDF document text
    • https://jagominum.com/contents/files/rogemivowede.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/59083935265.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613934d9ba234---sowezalenibirelulikuve.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/tebisepurejubexepewoli.pdfIn PDF document text
    • http://hongdacable.com/d/files/masekikepinefivanuxovivip.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/lotepumexogozi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/jiludamunazesid.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/lepomobusoke.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/lonatemavajeginorabonoko.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/safilat.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/tajusatanutujunoruvipifan.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/82187712771.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/11488736916.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///26158832698.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/25691871072.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/fetejik.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vemigemurunokumeziniw.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/ravuvubuduwawam.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/64471238276.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/vosavelelekotiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=index+of+rome+season+1PDF 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_off00010283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10283 18396 bytes
SHA-256: ef956fd64d8970be8520b29834feef74ea42bd9add7ab62e0aea33e9ea6bff4f
font_01_sfnt_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A34 10384 bytes
SHA-256: 767f33e12f539ab28c7fdc8fcdc5562ea98d779e054452a95bf4de9f23b06295

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