Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aba06504288ddcc…

MALICIOUS

PDF

72.7 KB Created: 2021-03-09 03:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4ccdd75f85aca0085a596735e8a3c77b SHA-1: 51b170342f6dbc98de78c7e577c90ec99c34b3ee SHA-256: 4aba06504288ddcc268981a8439575290e038afcfe96d03d7a12cbae2f1ace65
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, hinting at its construction. The primary attack pattern involves directing users to potentially malicious external URLs for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=allan+pease+limbajul+trupului+pdf PDF link annotation
    • http://it50off.info/47033258505h4gi6.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/briggs_and_stratton_550ex_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/ekhixib/5223669507.pdfIn PDF document text
    • http://1ux.site/43278820257p80up.pdfIn PDF document text
    • http://bridgecommerce.com/gevudakah2nd4.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/Ugha736/83056512123.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/top_startups_2020_canada.pdfIn PDF document text
    • http://italy50wow.pro/what_is_prophecy_foreshadowinghfac6.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/smart_calling_art_sobczak_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/VcjapV4/45956238748.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/ifAAZgi/96723353073.pdfIn PDF document text
    • https://cdn.sqhk.co/talurelope/33IPggg/the_wolf_simulator_gameplay.pdfIn PDF document text
    • http://scarcebook.com/tabla_de_densidades_de_sustanciasec28i.pdfIn PDF document text
    • http://ritual-venki.online/36434980433qj51c.pdfIn PDF document text
    • http://dududuw.mypressonline.com/96777740414.pdfIn PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/zhaeidt/15031651488.pdfIn PDF document text
    • http://fruit-italy.space/27535356963qyh17.pdfIn PDF document text
    • http://todayshop.website/fifth_grade_persuasive_essay_samples771gj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/cursive_small_letters_a_to_z_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/bodmas_examples_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/incident_report_nursing_management.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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 5392 bytes
SHA-256: ed2ab4ec674cfd112010a20eb97af36542891bf767000c21125e02da14c6181c
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 11508 bytes
SHA-256: 53c45adae4d266472a37aff93a67754a27c247ff967f5b1f6d9c9cc088914825

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