Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a208a1a10a3cad…

MALICIOUS

PDF

64.0 KB Created: 2020-12-18 19:57:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d4581c51f64f812aa0c1086ea22c9912 SHA-1: 653db2ffed17cb60bdaca6161f574ab8ce670a3f SHA-256: 45a208a1a10a3cade29379dccb91764e397ee75b088c613828eaef56366424b2
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature, classifying it as a phishing or trojan. The document body, though heavily obfuscated, appears to contain references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to serve as a lure.

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.
  • 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.
  • 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://gettraff.ru/wb?keyword=boulder%20dash%20xl%20pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415292/normal_5fbbfb924e4f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_5fd0bb8be67db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_5fb4559c1e881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445106/normal_5fd7e00a46523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fbf1a775538d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_5fa8ce28240d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4de60ff13940aa258fcf0/t/5fc941c4b456042f3f38edcc/1607025092670/my_events_calendar_wordpress.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4fdc5239b0722914b73e7/t/5fce8f5db2cccb3663a1802e/1607372637612/rapunzel_song_i_see_the_light_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc292a4e5c7695ca9a65d9d/t/5fc3e3a6a97599144e6fcb90/1606673318851/showbox_apk_2015_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc553139698b02c7f3e0be9/t/5fcf7bea5562961561542982/1607433195319/cupcake_recipes_easy_from_scratch.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/holt_mcdougal_algebra_1_teacher_edition_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc70934a3ccef3526e90d89/t/5fcd830c24c49707d336e208/1607303954075/minecraft_realms_minigames_best.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c8b6405d5340f335e453/t/5fcd6a899aa2de0c64a75a7a/1607297674197/7044989878.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_off0000bb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 5276 bytes
SHA-256: f42750e54cc8ca3d48935d662b594b81fb3dc70633bdd8b975aac2faa9005311
font_01_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 11820 bytes
SHA-256: 0f99e3c91fab867463d507769d513f9e5bba69e3ed22bd92e4fc03d5dc8a42d9

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