Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ea03f20f1d496…

MALICIOUS

PDF

87.7 KB Created: 2021-04-27 03:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 476fcd877dba31965c3bc5a662d83475 SHA-1: 7e78dd2d1627d6a4cc517ea3319168b4873556b8 SHA-256: 521ea03f20f1d496af781fd2a34ea5360bb1aea8306d7f7ac0f23550c3dadce4
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to suspicious domains and are likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=estructura+de+un+manual+de+organizacion
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/libimemad_tutamutu_semezevowurexe_vitamozeduva.pdf
    • http://carbags.site/super_crafting_and_building_2020_for_pcw5kaz.pdf
    • http://mgacessoria.online/97716269234byeaz.pdf
    • http://help-copyrightservice.xyz/8307612473d22d4.pdf
    • http://magicwoolshop.com/19837452633v5zhg.pdf
    • https://nutuvujupakumap.weebly.com/uploads/1/3/2/7/132740288/9540008.pdf
    • http://topchambre.xyz/xozujirowajovabadexefv170.pdf
    • http://ulekschool.online/17168086648pmpwj.pdf
    • https://cdn.sqhk.co/xenudipu/jhgigiJ/42845109682.pdf
    • http://ujjjrrrrr.space/ahsipaki_xalapa_facturacionkoj0v.pdf
    • https://cdn.sqhk.co/xidafigutoxa/cMcfuhE/ms_project_gantt_chart_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_53b007d762a045b2866b719464b39343.pdf?index=true
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_a81a7a1acdda48d29a749aaef5ba42ec.pdf?index=true
    • https://s3.amazonaws.com/kefodek/project_follow_up_template_excel.pdf
    • https://s3.amazonaws.com/dupula/bakery_adalah.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_82e317bb8c724a67b87c7f38173a9e97.pdf?index=true
    • https://s3.amazonaws.com/fulazelof/chemistry_worksheet_heat_and_calorimetry_problems_answers.pdf
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_22803298ef2d44b6aa4feedf1c81ce33.pdf?index=true
    • https://s3.amazonaws.com/vekodupiwarobi/book_of_symbols_download.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_b7f1b83554b347ddbaeb986f30659004.pdf?index=true
    • https://s3.amazonaws.com/dowavelaxam/betty_azar_basic_english_grammar_4th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f8.bin
25cc968adb8aa1353a61d4e93eac5c927d0e283e32cc5bffd8f7d9c212465219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 5148 bytes
font_01_sfnt_off00011a5a.bin
0fdd6235edda64675df73f019bfcf304f252a5d0449a08dcdabff84c4942c409		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 12012 bytes
font_02_sfnt_off0001411b.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1411B 4324 bytes

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