Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bce6e2f82da1004…

MALICIOUS

PDF

82.6 KB Created: 2021-02-19 22:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4058d3ef72980660be898c4a94e04107 SHA-1: debe699058a2a5f720d4fc22d1fc19b9eb4d51d1 SHA-256: 1bce6e2f82da10041b1189314f08ea6947ef3f6a7d626f8b99f7679e8af618e0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to a book summary, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=el+ser+y+la+nada+resumen PDF link annotation
    • https://cdn.sqhk.co/febutatesu/KhejerW/diversifying_selection_definition_biology_quizlet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_600589ea9e6e4.pdfIn PDF document text
    • http://yildirimotobursa.com/pagewizofutejabsscql.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/jbie4ha/hawthorn_bank_downtown_columbia_mo.pdfIn PDF document text
    • http://fenofojerafama.22web.org/bazoforale.pdfIn PDF document text
    • https://cdn.sqhk.co/takulowizi/gghaPYD/air_attack_ads_game_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_6023d24720756.pdfIn PDF document text
    • http://gemunoz.iblogger.org/qu_es_la_etnicidad_y_ciudadana_en_pases_latinoamericanos.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/pofodopoxukilosirlc99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414336/normal_5ff7618367a90.pdfIn PDF document text
    • http://imkl-checker.com/analytical_chemistry_formatkxs6b.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/iUlgeii/happy_birthday_stickers_for_whatsapp_ios_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorogeloma.epizy.com/chrome_app_for_pc_windows_8.pdfIn PDF document text
    • http://vilogitiligifez.rf.gd/saparit.pdfIn PDF document text
    • http://difesasud.epizy.com/pukagerebabiwuja.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_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 5028 bytes
SHA-256: f7f1eefcec793d9be321d8d8c14cbdb75ce3147f0e62634661c7251076356832
font_01_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 11344 bytes
SHA-256: 3524e9392f314be00068bf669e5b6b0b0b4eb2550da586314375fd3fc7f3c543

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