Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81eb315b63ccf33…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 09:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52b4688b44f1cc722a33ac28f78b84a6 SHA-1: e439d74f13ca6cc702fab5b46d5ceb34beb89d68 SHA-256: c81eb315b63ccf33dadaf8fef2e5d3a745396d5fd2bd4a9d975294d60b701691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with one prominent URL leading to a site that appears to be a link farm for software downloads, likely a lure. The PDF structure and embedded content suggest it's designed to redirect users to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=idm+full+version+free+download+with+crack+for+windows+10+64+bit PDF link annotation
    • https://siroyensao.com/upload/files/29561819592.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/80253396964.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/82045139039.pdfIn PDF document text
    • http://okvin.org/userfiles/file/ropanixapopimu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/85525492830.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/biwegotopevodowokir.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/jeruvipusosal.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/26796179393.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16141d372ed384---taxipebixelaxugetesik.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/ginuxisokodovuzumixe.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631523054.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vevipopixugip.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/vuvakigedixub.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/17102121512.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/29934198607.pdfIn PDF document text
    • https://svltv.in/userfiles/files/34361424163.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/96358911665.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/webeloga.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/15806840890.pdfIn PDF document text
    • https://comfort8889.com/upload/files/97427163442.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614179d23a0c5---lefusuzukogo.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/xerobexu.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_off0000d098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD098 17688 bytes
SHA-256: dae8074e6c74a40682b50c9fa107da7dfbc54027aa735216985f1ccdcd9586a7
font_01_sfnt_off0000fedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 11596 bytes
SHA-256: d661bfb3dfca30494c56d590ef8409558b8eacc8bec865efa5a42289fb4e361d

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