Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fe668a5b12d7b6…

MALICIOUS

PDF

72.9 KB Created: 2021-03-25 13:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0481c8727ab23636de536768c7c43d12 SHA-1: 2c98a82a8d84a3b246cae364994390e866ab85f7 SHA-256: e8fe668a5b12d7b61d1e6686e9b4d307989e70ee98753d2bc59c731b05707e5e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, contains references to 'pdf books free download online', indicating a lure to attract users to download more content. The presence of embedded URLs and the overall structure strongly suggest an attempt to distribute further malicious content or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=pdf+books+free+download+online
    • http://geparup.scienceontheweb.net/autocad_2020_2d_commands.pdf
    • https://cdn.sqhk.co/vodadavubex/LhfqhiP/63459796733.pdf
    • https://cdn.sqhk.co/zalopubid/hdGiiBl/21786098910.pdf
    • http://xuwuvewisin.mypressonline.com/tijatawuluvixikufete.pdf
    • https://cdn.sqhk.co/wexufenu/hfxn7MZ/buddy_throw_mod_apk_rexdl.pdf
    • http://piwulag.sportsontheweb.net/tipos_de_canales_de_comercializacion.pdf
    • https://cdn.sqhk.co/toliximozupa/ejahaq8/siraji_kabutar_photo.pdf
    • https://cdn.sqhk.co/dobulefipuji/KP2fjgC/52204711001.pdf
    • http://lumobumekola.getenjoyment.net/lanokorake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kujapomib/16210882295.pdf
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_352124b47e7d4f30b503d6112deaa8ef.pdf?index=true
    • https://s3.amazonaws.com/kukazowox/california_dmv_bill_of_sale_form.pdf
    • https://s3.amazonaws.com/divikufifir/app_lock_jio_phone.pdf
    • http://palenogawufagi.epizy.com/cantigas_de_santa_maria.pdf
    • https://s3.amazonaws.com/supefujoxopubu/72050814442.pdf
    • http://noroved.myartsonline.com/bose_wave_music_system_11.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_3decca0a83e84c15a7fd9f381d6e216c.pdf?index=true
    • http://kebojupevanivi.rf.gd/pefus.pdf
    • http://bibobega.epizy.com/jotaro_kujo_cosplay_guide.pdf
    • https://s3.amazonaws.com/vavapekadoliti/miss_world_2018_anukreethy_vas_performance.pdf
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_921f17b4e8a547349d72689956495cd3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26d.bin
5659ef5f85b3c612fed4e7374d3c9bf9b664bf70a94dc4fd57114d611892ae29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5196 bytes
font_01_sfnt_off0000f43d.bin
d54f8ee912a93b70626441cd07d415c1deb9c089cc0e68fcd6e118e4cce37585		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 10016 bytes

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