Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4cb5de426d0f09…

MALICIOUS

PDF

67.1 KB Created: 2021-03-01 02:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ba3da9f9cf5e36c105cb1a43969f0113 SHA-1: a22d8ab193f3ea7fd96e13e234ae97be1b0c7160 SHA-256: ed4cb5de426d0f09c5e9aad50445c8f561a52d3952679ba5a388b8a2bb5130b1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to product searches, reinforcing the lure aspect.

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://maypoin.ru/award?keyword=roku+streaming+stick+plus+headphone+edition PDF link annotation
    • http://dofujifeluradep.medianewsonline.com/facebook_georgia_marketplace_cars_for_sale_by_owner.pdfIn PDF document text
    • http://italy-small.space/470198496154f4jg.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/tukofigibomesig.pdfIn PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/8469062.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/fufoxopufop.pdfIn PDF document text
    • http://sunshop.pro/seven_seas_ballz_deepd2a0l.pdfIn PDF document text
    • http://cmb-societe.com/map_of_the_world_with_continents_and_oceans_not_labeleds460b.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/the_conference_of_the_birds_ransom_riggs_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/wogirujut/idbifs3/88802294961.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/gxgdjfw/48275855628.pdfIn PDF document text
    • http://ravapusevuj.iblogger.org/gm_diet_plan_cabbage_soup_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/ThfFShf/bloons_td_6_unlimited_monkey_money_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_601256828781c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5fc5d195e6998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wavubodalut.epizy.com/jenkins_test_report_xml_path.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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 5556 bytes
SHA-256: f8194aa4016bab9c36b6aed3f659611633697da6220a57009548ad51dd52a047
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 9940 bytes
SHA-256: 4e1e6827a589012136055c8867aa9b643d973086f482673d2e5031f4ebfaabe0

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