Malicious PDF — malware analysis report

Static analysis result for SHA-256 011b60c9316b148b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 21:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21cb15a127f669cf46ffefa81f5f42b1 SHA-1: 4f3b5b3645c0ec4224388c6265436797094848f7 SHA-256: 011b60c9316b148b9a30665bbb94f7862ef804536eb8c620af440887596208c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=the+office+season+1+episode+1+putlocker PDF link annotation
    • http://www.dereformasenalicante.com/archivos/files/76666463782.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/26311033871.pdfIn PDF document text
    • http://opersan.com/file/fedewademupibowo.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/66299873777.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/63932290379.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/80093154094.pdfIn PDF document text
    • http://theponghop.com/upload/files/35212113200.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/nilawogid.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/fuduborajigisalaredaro.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/71312414510.pdfIn PDF document text
    • http://metabolit.ru/files/file/40658198785.pdfIn PDF document text
    • http://effektfilm.de/files/file/36494173515.pdfIn PDF document text
    • http://northcity.rs/slike/files/kufisa.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/56841766085.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/56231782613.pdfIn PDF document text
    • http://wohntraumgmbh.at/51218775539.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/netaxodasavigobamolu.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/19250287641.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/visariditoxogivutebuneve.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/ratekurujaw.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 16764 bytes
SHA-256: 93c6f1ede381e3679c7ce3b640cc44a676da0b7eb9420f5a5f19858277c9b9d9
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10924 bytes
SHA-256: ad194329d407c0bc84b70bda3c8ea4d2a1b4fa0cc1e7734ecf021481fb6414d6

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