Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7105aa75671be…

MALICIOUS

PDF

84.8 KB Created: 2021-04-03 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0802c4a7983195937d0348ca495752e SHA-1: 1148d99a1f1092aed02a0a04a0f33908f828f79b SHA-256: 4ea7105aa75671bed6ad2ef08d33cd0d486a5295d654a1082c0ccce47d5344eb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to 'vilenefex.ru'. Heuristics indicate the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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://vilenefex.ru/award?keyword=braun+audio+310+pdf
    • https://cdn-cms.f-static.net/uploads/4387919/normal_601dd7ad249e1.pdf
    • http://nibobokil.66ghz.com/infographic_timeline_template.pdf
    • https://static.s123-cdn-static.com/uploads/4408993/normal_5fe5ec34ab4f2.pdf
    • https://cdn-cms.f-static.net/uploads/4448551/normal_60579e4e9c27c.pdf
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fcf05610ef45.pdf
    • http://wugumonisukanib.sportsontheweb.net/number_system_in_english.pdf
    • http://wudebakafepi.mypressonline.com/online_shia_books_in_urdu.pdf
    • http://tokepubex.getenjoyment.net/tatomalowabivefoxur.pdf
    • http://desararixiwikos.22web.org/lista_de_antibioticos_veterinarios.pdf
    • http://sivupagelif.iblogger.org/spartan_swing_trading.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://juxugalipexobow.epizy.com/84904407653.pdf
    • http://bajekixizosi.myartsonline.com/25932949125.pdf
    • http://jenesigafepi.epizy.com/internal_medicine_clerkship_guide_paauw.pdf
    • http://jegowijuvu.epizy.com/kirefutid.pdf
    • http://kufekuduvedeni.rf.gd/28865401072.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_0b8e8030a47440a2a9d9b81df2cabe58.pdf?index=true
    • https://cd65756b-a9c7-4cca-9498-1747a6459195.filesusr.com/ugd/05eb20_d1437a8530d84eb7964e2487aa58811d.pdf?index=true
    • http://ravexigulot.rf.gd/kujivuvigadorekilixu.pdf
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_bb3548b8726548ad867b47f89de4aaf5.pdf?index=true
    • http://terofiwewu.rf.gd/pulse_width_modulation_nptel.pdf
    • http://sarupisegov.rf.gd/collapse_of_the_malolos_republic.pdf
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_63810827f1a44d098cdeeb887b56caef.pdf?index=true
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_a09b6edf5c2c4b25bd7c1149a7324359.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b9.bin
3280afd4eee8bed82c7449264754e50fd5a78d15d8709b4bc61eca9e3433eb8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 6288 bytes
font_01_sfnt_off0000ed20.bin
144bdcfb6b9481d6f2cc2f963fe570cb2cbe7f99da1b223434339f792f3b3814		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 5232 bytes
font_02_sfnt_off0000ff03.bin
84149cf450129f2905b0b08e885f20616e64e602c97a53577860f4ec1bb3d0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 15856 bytes
font_03_sfnt_off0001300c.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 16204 bytes

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