Malicious PDF — malware analysis report

Static analysis result for SHA-256 065f90284c487a5b…

MALICIOUS

PDF

66.5 KB Created: 2021-02-21 08:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7bf29b25fd4e279cbfe182665bdfcb66 SHA-1: 1e693ada4b0dec471598571ddd9ca5085d7305c0 SHA-256: 065f90284c487a5b2cd3a1f54e5f15b82f387af26b4cd8492a54b61ff5a5c992
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to potentially malicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is part of a link farm or phishing campaign designed to redirect users to malicious sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

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://jottigo.ru/strik?utm_term=polynomial+long+division+worksheets+no+remainder PDF link annotation
    • https://cdn.sqhk.co/petebeki/zpibvha/photo_3d_album_gallery_download.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/9674016.pdfIn PDF document text
    • http://boxberry-24.cc/sobalotizutxcfvy.pdfIn PDF document text
    • http://nikepexi.22web.org/jamokizilekuvedi.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/hfc7QHx/napakimiludibakerawuk.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/CicCia8/jowidowano.pdfIn PDF document text
    • https://cdn.sqhk.co/takodabu/jahhNjh/wazokugaw.pdfIn PDF document text
    • http://maewallace.com/33963669525fxch0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/ac3_audio_codec_for_mx_player.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/biripukokapemibi.pdfIn PDF document text
    • https://s3.amazonaws.com/luropiw/lumekologiduvof.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/batuni.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_off0000bad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD3 5348 bytes
SHA-256: 45f8fb5ca6c55da79bfe894567f8aa3c87467314ce2eb110d0f0769bf8c9be53
font_01_sfnt_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 9352 bytes
SHA-256: 61f1b42d3c734bbcb5dc0128590c4b22c54a1464968b6edf3176f508c93b91c3
font_02_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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