Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa5825ba2759845…

MALICIOUS

PDF

78.7 KB Created: 2021-03-25 08:13:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23895344c517d28083c1d2a739462cc9 SHA-1: 352100b6e5379d06993c85985b7ca1d718cfc8fd SHA-256: 9fa5825ba27598456cac41dcad9e5c365c2727fc0f1ac1febf5988836626fca8
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'lyrics' and is associated with a URL that appears to be a lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the PDF is part of a link farm designed to redirect users, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=how+bad+can+i+really+be+lyrics
    • http://lezigovedavide.getenjoyment.net/nasb_macarthur_study_bible_2nd_edition_premium_goatskin_leather.pdf
    • http://mavedelusudefiv.22web.org/55007553216.pdf
    • https://cdn.sqhk.co/kasuvapexal/cdTvKnJ/70_disco_music_hits_non_stop.pdf
    • https://cdn.sqhk.co/mavozopofug/hjcEjiU/fibazekupebofu.pdf
    • https://cdn.sqhk.co/tememagitapo/ifjajaU/23575260441.pdf
    • http://moxegelubopidi.sportsontheweb.net/96341713167.pdf
    • https://cdn.sqhk.co/rufosopufu/hepFgg7/81520775958.pdf
    • http://gupiduwexe.22web.org/anganwadi_form_haryana_last_date.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wisotujapu.epizy.com/74772545888.pdf
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_86b002101eaf47888f4b0884b407ca45.pdf?index=true
    • https://5121d360-3808-4f61-aa44-d87cf2d9d428.filesusr.com/ugd/032e8a_92ecc379f0bb47079925f8448c20a48c.pdf?index=true
    • http://solejow.myartsonline.com/julius_caesar_quotes_and_analysis.pdf
    • https://s3.amazonaws.com/viregujipowuru/39952246722.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/nevux.pdf
    • http://paxafumalinuber.epizy.com/wordpress_admin_404_not_found.pdf
    • http://leriwegozeko.epizy.com/74490457564.pdf
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_648cacb9a5fa42f89bde7f72cc67cbe9.pdf?index=true
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_15c77ca7e8104f08b57e5045f49fc847.pdf?index=true
    • http://koradanizepagow.myartsonline.com/parajumble_questions_for_ibps_po.pdf
    • http://matasup.rf.gd/54363236741.pdf
    • https://s3.amazonaws.com/bisapovepizaj/where_are_the_four_lords_in_dark_souls.pdf
    • http://sipopos.epizy.com/21900427673.pdf
    • http://kepinud.rf.gd/big_data_techniques_and_technologies_in_geoinformatics.pdf
    • 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_off0000f728.bin
b1f12f174709c4e46f469cb4d8fd744689ce24e35dbfb3a1f36f9447d1026e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 5228 bytes
font_01_sfnt_off00010912.bin
2e6deaa5f71477538bbd98d0587c34aace843d315791a957517ac720ce7f7a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 10816 bytes

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