Malicious PDF — malware analysis report

Static analysis result for SHA-256 051ed6a16b5148cd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 09:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52387b1b4e2a2f4ab8494e36245c5774 SHA-1: 4a7e2562130b99d51b85b4208a8547c0adef2188 SHA-256: 051ed6a16b5148cd7fd2a659de904da84990f2752cff9618d7201bc65e331ed5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://manisafar.com/basefile/marcosafarir/files/zisikepujurufofetufi.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fac758d01---jirakefuzawewewilarovu.pdfIn PDF document text
    • http://jn-zhsc.com/upload/54240802683.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/vosokisuwipu.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/falopadupupatenikod.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/48865331514.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/7227303113.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45818b8de---xufanesavivagifomunu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/6637700616.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/varopusulogejixadobakikok.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/nugedevoxikomutobojijisaj.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/nonubutitefere.pdfIn PDF document text
    • http://thegioioto.store/upload/files/najir.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/23255204488.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/sozige.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/35611998493.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/kobaxumilira.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/zadixufilawewewapemol.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/sazepajozuwaji.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/najexinovapawemedoloki.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/nulirikivifuwalado.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/82923413538.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/sukumiguvokugamuxirab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=yanwa+premium+apkPDF 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_off0000c5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 10240 bytes
SHA-256: 5c5fcaa61b3cc4bdfa70ed58db7ab915c5aab23691ce7c74c4efc5adb16dfb9f
font_02_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 21900 bytes
SHA-256: 14334e0aaa358636a5479107586cb4cdf11ff6393cf46b8e0d05215f32b10e83

Open this report in the interactive analyzer, or submit your own file for analysis.