Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91b1e97f1a6987b…

MALICIOUS

PDF

80.8 KB Created: 2021-03-01 10:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fb9d19196ca1d22e8a311cdf2f5de8ee SHA-1: 20d0824427b3c9964fcdaf928eb256f57a4c91dc SHA-256: e91b1e97f1a6987b39aed7a2063a2ed1668fb67fe6f8424c0206a13d04961ee0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a redirector for malicious content. The presence of external URIs and link farm heuristics suggests an attempt to direct users to potentially harmful sites.

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://dugedepap.ru/strik?utm_term=can+i+use+a+universal+remote+for+roku+stick PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421770/normal_603200a06f688.pdfIn PDF document text
    • http://fresh-ita.fun/73231517548dy52.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/26325250075.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/igRwifX/black_hole_vice_city_game.pdfIn PDF document text
    • https://cdn.sqhk.co/saguregifu/giifjfP/kovazos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5fdb0b72f0911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5fe35ef802316.pdfIn PDF document text
    • https://cdn.sqhk.co/rizavoxaje/hbdG4gc/venus_fly_trap_winter_care_uk.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/nalibotorife.pdfIn PDF document text
    • http://runolive.com/74477654624i7oew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453560/normal_6009a33456b96.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/hgjiDig/jungle_jump_adventure.pdfIn PDF document text
    • http://maewallace.com/vonusid3b9m.pdfIn PDF document text
    • https://cdn.sqhk.co/vogidasobe/ijii7Xf/emperor_and_beauties_game_mod_apk.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/homemade_poultice_to_draw_out_infection.pdfIn PDF document text
    • https://cdn.sqhk.co/rufadexu/gAqhhKN/minecraft_modpacks_with_chisel_and_bits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dunepinewurebef.epizy.com/10th_maths_formulas_file_download.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/porque_estudiar_administracion_de_empresas_yahoo.pdfIn PDF document text
    • http://rojofamukasefi.rf.gd/pads_parts_library_ascii_file_format_specification.pdfIn PDF document text
    • http://zipokuxabatu.rf.gd/21348071649.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 5056 bytes
SHA-256: 54de39295d275a16965ab591a2ce3386bc48ffb86eec57c9d902455617ce40bc
font_01_sfnt_off000104ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 10048 bytes
SHA-256: 339c9ad3c538687d13b86ae8aa58ba12e6acdf004bd280b2b16a428a89a72028
font_02_sfnt_off00012712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12712 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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