Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ea8977548f8005…

MALICIOUS

PDF

77.0 KB Created: 2021-02-08 23:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b55262e72efa7f7b17a296680699868d SHA-1: 7c728b84d4a890b3f6e4edd4ebbb89bf5e3e3b8b SHA-256: 37ea8977548f8005500d26b5bf33b232c5f6540729c5b62a182bba760de2a02e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm, with several pointing to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=expo%20react%20native%20action%20sheet%20example In PDF document text
    • http://com-signto6.xyz/nijofiluzigetifizodofinud7c5an.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5ff0167d63dca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5ff7fe108fe3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5fc8c21e0e26a.pdfIn PDF document text
    • http://blockhcain.host/rufejifajidewodisomedijorrjtj.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/hcgcGgC/download_warcom_genesis.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/jdZiihe/teachers_pay_teachers_multiplication_worksheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379984/normal_5fccebd64ed92.pdfIn PDF document text
    • http://ru-payment.casa/43352326969s8hsm.pdfIn PDF document text
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/a1cc9703825.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/4hbhihd/cfop_f2l_algorithms.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/gopuze/72957852531.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/15288858032.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/anand_movie_songs_songspk.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/17280223194.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F3 5260 bytes
SHA-256: 82aa0dba82b24a017fb2ff95ed0f17df7cad882b536530dcf735c9a8bfd5e477
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 2696 bytes
SHA-256: 1cf4f7d4e33da384b8208c099ef60b689ca6aae25858bceb32d068f571449879
font_02_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 11472 bytes
SHA-256: bc2ab2e94569651eab5bb3ed6a5aa854fe6e9e38e48fc03f1fd62169892231a3

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