Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f2e20f0a2bc8db…

MALICIOUS

PDF

93.8 KB Created: 2021-02-17 02:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b07332fb11de0441a1951ea19c545aaf SHA-1: 3ca8092ea47340682c155125deb2c0f04c907c50 SHA-256: d5f2e20f0a2bc8dbace9fe7a368c3c0caba82a037511c1726d375a3e91bb4846
126 Risk Score

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 trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=colorado+school+of+mines+course+descriptions PDF link annotation
    • https://cdn.sqhk.co/gotoruzud/YbxJx2x/clash_of_generals_3d_clans.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389604/normal_5fcf156b9fc73.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/lvriilK/clicker_racing_mod.pdfIn PDF document text
    • http://legalvictory.group/100_veces_pappou733s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491673/normal_5fed62c81680d.pdfIn PDF document text
    • http://trylait.club/22918185337ldedu.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/gS0YJig/download_game_fruit_ninja_free_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_5fd7cfb2dfe40.pdfIn PDF document text
    • http://rat-red.space/francois_damien_streaming5vrgj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fe769d9559d9.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/ggljegc/paninideviveramubukiniwi.pdfIn PDF document text
    • http://fitdieta.com/manualidades_de_papel_paso_a_paso_facilesa9ueh.pdfIn PDF document text
    • http://digitalmedialit.com/1354718789jq2ln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujapaporetakik.epizy.com/appreciation_letter_sample_word_format.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_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 5300 bytes
SHA-256: 9119562428528879fee9b56828f672c431e3e8614b3a91eac08f2614b8362394
font_01_sfnt_off00014549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14549 10752 bytes
SHA-256: 872ea6b56dc5b3e54a4b4933e9639c675e1f3bd875a09fc61243e778e64a657f

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