Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cf10369fd7f68b…

MALICIOUS

PDF

75.5 KB Created: 2021-06-06 00:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8f89f2d214c0f47874840c775bb0a25b SHA-1: 7d5a39635df36c56847a8a4d95b6dcd7751d3784 SHA-256: c7cf10369fd7f68b5595cf9065b3e4f192688aad9de3ac7540fa35c03edf1293
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/pbw?utm_term=loveshhuda+full+movie+download+in+1080p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387037/normal_601aed2e90ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd89a23965c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_604a8b214fd79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fdd35d628c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477892/normal_6021a026c9604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_60055a786bc11.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446773/normal_60b006ff482d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_60186425bc239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_604810183168b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379837/normal_5fff7ce12e07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5fd160f3762d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60202749aeeb1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://palixazoke.pbworks.com/f/sentry_safe_default_code_x075.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144525585/nebeturoneboxenadixedado.pdfIn PDF document text
    • http://noxixap.pbworks.com/f/gunawajonapekotapak.pdfIn PDF document text
    • http://zemenifinabe.pbworks.com/f/15614458775.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/how_to_convert_from_kg_to_cubic_meters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e453bef-3496-41ab-a767-f96e27cd094d/80669405236.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144585810/zexezidutujusazog.pdfIn PDF document text
    • http://gexufak.pbworks.com/w/file/fetch/144555321/can_have_to_must_exercises.pdfIn PDF document text
    • http://tekitejug.pbworks.com/f/computer_organization_and_architecture_morris_mano_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/847554eb-c8b6-48ff-8777-22f684a93cb2/kokupe.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/8019811217.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5664 bytes
SHA-256: f8be48bd3062f2be9a1fa0517e29cbcdcfc80c9928f8f8939c5414ad6d602661
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10340 bytes
SHA-256: 9177e09cb11f862e440b83ea2691fd8141ff7baddc5a8a4a167a55ab6539273a