Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ea237108e191d…

MALICIOUS

PDF

84.0 KB Created: 2021-02-15 05:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3b8c18dd169a2095e095bba781ad6157 SHA-1: 0cdd4ebddf333a68e5c128cd4bf542655b380027 SHA-256: 544ea237108e191d6c35bbebab732af488f7800132ffafa5f8975a420989bedf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous embedded URLs that redirect to various PDF files hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a specific book title, likely used as a lure to attract users searching for that content.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wix?keyword=microbiology+12th+edition+tortora+pdf PDF link annotation
    • https://cdn.sqhk.co/ponesigis/Yjigfic/xiras.pdfIn PDF document text
    • http://brosbass.com/24415530358z8ta4.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/gilgh2p/magic_fluids_free_touch_screen_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/nYhjgjQ/best_c_ide_and_compiler_for_android.pdfIn PDF document text
    • http://scarcebook.com/phoenix_local_news_fox_103ftpf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ff6376837fbf.pdfIn PDF document text
    • https://cdn.sqhk.co/gizivapejoko/dsrhaWZ/asteroids_space_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/coiqAhf/falling_down_lil_peep_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/LduigVp/vatetawojejivusofunakar.pdfIn PDF document text
    • http://gavewedek.iblogger.org/fun_math_worksheets_2nd_grade.pdfIn PDF document text
    • http://ryursew.space/zevudepelerezodenajv31j.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/xixonu/95507939610.pdfIn PDF document text
    • http://lubudag.epizy.com/b_h_road_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/tosir.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/pdf_file_convert_to_excel_online_free.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_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 5668 bytes
SHA-256: 0c6538b349bd8e9c748d50a9b3ef7f012ce2f947ca495c71ea53df57f47eb5b7
font_01_sfnt_off00011ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDE 10436 bytes
SHA-256: ec9b9892c68a0f97c772c33e8dc4b5e98d061efb66a25e9f856e4df2898c7d1d

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