Malicious PDF — malware analysis report

Static analysis result for SHA-256 f389a4bb0c04093a…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 03:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a89ffd14f623c0de57bd6543813892fb SHA-1: 110c5ff89b5ffab48723c314a93ad620991744ba SHA-256: f389a4bb0c04093a813b336e66d15e40fd941b13f45a131c3af56a497b40bab5
214 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. The heuristic PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK indicate a strong intent to redirect users to external, untrusted content. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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.
  • 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=kundalini+yoga+asanas+beginners In PDF document text
    • https://cdn.sqhk.co/xolofiwano/gigc7hd/beach_survival_island_2017_savage_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450634/normal_5fed0bd39d55e.pdfIn PDF document text
    • https://loxeramulerizal.weebly.com/uploads/1/3/4/4/134476298/rolikulanuwa.pdfIn PDF document text
    • https://gafujoneruxuf.weebly.com/uploads/1/3/4/7/134728567/dunevigomow.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/jMjgKgd/sniper_shooter_3d_hack_apk_download.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/nipuzifatuf.pdfIn PDF document text
    • https://cdn.sqhk.co/guxuboru/OOjj6sQ/79123004179.pdfIn PDF document text
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/5ce930b71d9ac88.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/d8ltvdB/cbse_class_9_maths_book_price.pdfIn PDF document text
    • https://gefetejumifigo.weebly.com/uploads/1/3/4/6/134688955/143750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476275/normal_600917c822a09.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/hjHbjih/wejemunirupunuzuximu.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/lazolapabini_ruzizod_zafubatem.pdfIn PDF document text
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/magogav.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/927636b0ce9e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383791/normal_603e24cc95ad8.pdfIn PDF document text
    • https://tolutewegudef.weebly.com/uploads/1/3/4/0/134097468/23813fb5e.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/setigafat/what_is_big_little_lies_book_about.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/balto_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/57437658360.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/tifuwalimu.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/sql_for_data_science_free_course.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_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 5204 bytes
SHA-256: 21f5bf5c878a82efea7b288d1d0d97b08688a66b835e81566e794e46133dfcd7
font_01_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 10656 bytes
SHA-256: 4d5e2a9f4b566b22b84a9ba741f2dd98103add8580afb243dec46b083db94433

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