Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90d8772206d66c1…

MALICIOUS

PDF

76.0 KB Created: 2021-02-24 18:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ce160bdc0bc4955b941dd4c2b2f9735 SHA-1: 7ee23c3c17477bcb9ad8fee1ddb698462da28d85 SHA-256: e90d8772206d66c1878187821eaa16bdcbe62c2c9d96902edcc60bbc204427a7
156 Risk Score

Malware Insights

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

The sample 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 hosted on various domains, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=planet+earth+freshwater+video+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/toruwapelot/ggiWjgg/dejipovibigivefamapona.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/buginef.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/428751.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/chhhjge/misififon.pdfIn PDF document text
    • http://mmmuuuue.space/602280925491im1o.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/fukuzakuweja.pdfIn PDF document text
    • http://shlifovka-pol.website/73929505519b0q7b.pdfIn PDF document text
    • http://urolog.xyz/mimujxmu6u.pdfIn PDF document text
    • http://studyweb.site/1000_words_text_examplef8b7k.pdfIn PDF document text
    • https://cdn.sqhk.co/siboxowimu/NxijVii/jump_jump_helix_ball_jugar.pdfIn PDF document text
    • http://verification-help.com/vaxogojamodid6zyyi.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/aG1oO4R/37301727481.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/zuguvoxoki/43516563645.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/kisetusixadudewakulil.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/47740786290.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/adjective_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/bow_tie_medical_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/html_form_templates_angularjs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 5312 bytes
SHA-256: 58e59884f73dfae83931561b72c5edcc8597cddb57a9e43966d2259ef813da69
font_01_sfnt_off0000e832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE832 10648 bytes
SHA-256: b995454b5267a0f5aa46826ea95357354d44e1c520db94f6f82072560af6b0c8
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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