Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c23b61dbad17a4…

MALICIOUS

PDF

74.6 KB Created: 2021-02-17 13:33:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ac389c791a15e0e192f2486f630df1ea SHA-1: d1a7e84e190e649859c50716c3880a17611ade88 SHA-256: e3c23b61dbad17a4863541071a583e128d719e392228630ef6f21d5b0c0135d5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'bologen.ru' and another to a PDF hosted on 'cdn.sqhk.co', suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://bologen.ru/strik?utm_term=navien+ncb+error+codes PDF link annotation
    • https://cdn.sqhk.co/juxefirapuf/iazijij/libotaranomirega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_6015b2af14660.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/xawizifaloxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_601c79a650399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fe2f115acdaf.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/cjgOhe0/xuzakafusiginesubeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5fda5dcd2f92b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443576/normal_5ffe560fd0a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fccc3447a8fd.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/biaigPX/xaxemukig.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/DmxhGji/94646673495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6017b4073e25e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/24359557711.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/29011333673.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

Related samples 5

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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5068 bytes
SHA-256: 6b548feed01d7ff8f3eaa8535473bd742835d0f2c8be5984da4cad99568e1b30
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 10148 bytes
SHA-256: d621cca0155388d1fbfc5d602eef5c92ff4efd77df636e426a531aebd45a5c5d

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