Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b793d80015d9e8…

MALICIOUS

PDF

81.0 KB Created: 2021-02-20 00:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 45c319461e5ab43f1e31edda94d5e02f SHA-1: 8df95d9d57e325a3b2649fddf2686011937882cc SHA-256: c1b793d80015d9e88ee3534366fca18a214ebbe0884c9f6188294f337994edb0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=make+way+for+the+king+budweiser+mp3+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484376/normal_60076eee82b13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_5fe39b9500011.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379626/normal_5fcaf3cb30205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_601f11929f54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_6019de3c9975f.pdfIn PDF document text
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/fijonuwuzijigipopun.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/1493603.pdfIn PDF document text
    • http://wekeb.space/manual_usuario_iphone_xr_en_espaolya6jg.pdfIn PDF document text
    • https://biwawabagukolaz.weebly.com/uploads/1/3/4/7/134730268/duxegu_vovufulibap_burutulameva_fatusa.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/37341.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/jaxakig.pdfIn PDF document text
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/1ba02efe96c221.pdfIn PDF document text
    • https://jekowidemovo.weebly.com/uploads/1/3/4/7/134702183/5983270.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/7415911.pdfIn PDF document text
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/xulos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fe6af445d32d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 6020 bytes
SHA-256: 1816896844494dcd56de99a3a8c56d869c90a45177fe3dfdc8214a3d7f83dd77
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10940 bytes
SHA-256: f49bec637854532693cfbcb5345b0ae566b1db28fda778591536db4d0af7f9a0

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