Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b9b1540375a1fa…

MALICIOUS

PDF

82.7 KB Created: 2021-03-31 16:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d7e22568daa73d72bdb9358bb46438c3 SHA-1: a9316c8200926d7aaa1462acda187a0c4f270ac7 SHA-256: c4b9b1540375a1fa2fc3ab73b7355ff373cd78fb1cbc155a2d78a349a556d5c9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to URLs that are likely used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pelibifir.ru/strik?utm_term=analysis+of+transport+phenomena+deen+2nd+edition+pdf PDF link annotation
    • http://sis-paypal.com/wakuwukasc90p7.pdfIn PDF document text
    • http://pidikugojan.22web.org/diccionario_de_espaol_y_ingles_traductor.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/wawojogab.pdfIn PDF document text
    • http://shtancircul.site/82531225940blgry.pdfIn PDF document text
    • http://thedouche.xyz/themeforest_shopping_ecommerce_html_templatei6db2.pdfIn PDF document text
    • http://impergamon.com/xixupoxijatogabamavapofje7sn.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/kemamezinupitau9k2l.pdfIn PDF document text
    • http://basikoz.iblogger.org/arabic_english_keyboard.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/98488802881.pdfIn PDF document text
    • http://pexaxasub.iblogger.org/are_husqvarna_riding_mowers_good.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/81317407260.pdfIn PDF document text
    • http://waniwidolo.66ghz.com/tufakawa.pdfIn PDF document text
    • http://mifirejetevina.getenjoyment.net/mubof.pdfIn PDF document text
    • http://yandex-delivery.cc/68423549599qdjsw.pdfIn PDF document text
    • http://olivamebel.com/death_road_to_canada_hand_upgrade5iu3l.pdfIn PDF document text
    • http://ridunculus.com/birizovznsxf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rafodize.rf.gd/subject_verb_agreement_weekly_grammar_worksheet_answers.pdfIn PDF document text
    • http://sewitowapib.epizy.com/golden_rice_genetic_engineering_process.pdfIn PDF document text
    • http://rutogul.rf.gd/autumn_leaves_lead_sheet_gm.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/42425570109.pdfIn PDF document text
    • http://valamujunitun.epizy.com/assyrian_dictionary.pdfIn PDF document text
    • http://momoxorepuvo.epizy.com/61627110209.pdfIn PDF document text
    • http://xeravujowa.epizy.com/microsoft_access_crm_database_template.pdfIn PDF document text
    • http://fuxurekosorozu.rf.gd/rotowalibefewuk.pdfIn PDF document text
    • http://jifulig.epizy.com/collateral_management_agreement.pdfIn PDF document text
    • http://xabudavadeguvo.myartsonline.com/christianity_and_african_traditional_religion.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 5504 bytes
SHA-256: 2cbf65d983441668671f7300ceb9bc24f8ce187d0bc3be280c6def08d693c262
font_01_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 10828 bytes
SHA-256: 1e7bee2936d280989f4b2003c72baa2232514db5e25aa0614ff614641ea4f85c

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