Malicious PDF — malware analysis report

Static analysis result for SHA-256 285e6ec19e659982…

MALICIOUS

PDF

72.4 KB Created: 2020-12-22 07:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a5f795fcbc6c0da06791d7748516b79a SHA-1: 1784892681374b2d1bddeb33e3a3513a562c6afe SHA-256: 285e6ec19e659982e2fb314f1c01c46a1e117316ec9743d467285c469f95b9e2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDF files, suggesting it's part of a link farm designed to distribute malware or phish users. The embedded URL 'https://traffnew.ru/strik?utm_term=medibang+paint+make+art' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=medibang+paint+make+art PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fa5988425e8c.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/d283aa.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/kavud_rejidopaveni_nuxujikalobek_virazuzegivuju.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/teramakirej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_5fbefe407a757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5faf87f2d75b4.pdfIn PDF document text
    • https://godowipi.weebly.com/uploads/1/3/4/5/134520373/3157141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fdfcc9592ab3d568945385c/t/5fe03bf32da99c2868498605/1608530932558/35434656086.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e27b1d38-fdde-4411-954c-d3cf1b45e5de/tasobevozusimurigadinupe.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/aia_insurance_brand_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/salubafetoworosa.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/45500937400.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/bivanerelegi.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/caesar_3_windows_10_free.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5280 bytes
SHA-256: 84139751ab29163a889d86997118608616426eeca65b8c13d221408aa298e117
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10556 bytes
SHA-256: 9734c0e0eb0108b1dfad5f845d81ff07529d3a8c8058130128fd1161e8b77ee0

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