Malicious PDF — malware analysis report

Static analysis result for SHA-256 0396b638ba0c0e31…

MALICIOUS

PDF

68.2 KB Created: 2021-02-14 15:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ff9819a69509387f554960d590898137 SHA-1: 6e5f09e9c6a87fdb5210f61bcf365222091dd8b7 SHA-256: 0396b638ba0c0e313fece135ce0702660fcb3b1f67f05011c566cb9c9ecfafe2
156 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and a high-confidence ML classifier flag, indicating malicious intent. It also features a lure for a live stream, directing users to an SEO redirector URL. This suggests the document is designed to trick users into visiting a potentially malicious website for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://druttle.ru/wix?keyword=portland+trail+blazers+vs+pelicans+live+stream+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5ff7099f49f44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_602092f432479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5ff4822986428.pdfIn PDF document text
    • https://cdn.sqhk.co/zisuzunon/lHjgpFg/bloons_tower_defense_battles_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/h8Zehbp/nasa_logo_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/ggLjdhj/download_army_toys_town_mod_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_5fe75b1444e5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_6007be7abe384.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5fda7ed49a0f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5ff915bc4874e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498376/normal_6027ab720bad7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_5feec7bff1766.pdfIn PDF document text
    • http://www.edigitalplace.com/amember/aff/go/nuhash247..clickIn PDF document text
    • http://www.edigitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinabisura/48506549536.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/android_10_gesture_navigation_app_drawer.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/iconoclasts_ps4_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/vivin.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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 5552 bytes
SHA-256: e6b71965cf84cebdfdb9f6e3af55bc44886961ab02d3f3c65166dba713cbb668
font_01_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10532 bytes
SHA-256: 54e899d5d5edfa201bd91fa6cd282e0372caf5a978b44f2d46f826bca28e8820

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