Malicious PDF — malware analysis report

Static analysis result for SHA-256 d319309b67ad2f16…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 18:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9e36fc977f27047b95929790d4870d78 SHA-1: df78eeccd7c53b69e8e11e680c68d61f6738bb37 SHA-256: d319309b67ad2f1660001c8ee30bfcbc42d3bbdd3d3cdf61530143d5b7692691
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDF files, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://crophysi.ru/strik?utm_term=which+is+better+556+or+300+blackout PDF link annotation
    • https://ponirusorigimo.weebly.com/uploads/1/3/0/7/130738629/junorov-firaberedaviti.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/mowamumarukubiwo.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/kubajamudim_rorusari.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/vulisomogef-kijolalipani-silubepiwur-jijibuwaso.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/qjCGChd/study_skills_activities_for_elementary_students.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/hh4ejj2/tap_tap_builder_online_generator.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/207141f.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/zoredodopem-medowavuga.pdfIn PDF document text
    • http://borezopesane.22web.org/akira_kannada_full_movie_hd.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/jusagi/xowifiloxerefekurevasovip.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/83383598416.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/43588045380.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/nakuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/52699694180.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/celebrity_quiz_game_answers_level_1.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/valuro.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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 5688 bytes
SHA-256: 699590243e2a5ec427934510126864a2035b566e0a20a433f60b845f889f1a47
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10540 bytes
SHA-256: 28c1349adfd4eeef28667f57aabc5f418ada6836379635eb798587953336a899

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