Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ea4d3e9d43ff5a…

MALICIOUS

PDF

109.2 KB Created: 2021-03-23 00:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06d61bc37ed9044a621d95aa915556d7 SHA-1: f103141f85e0b0fbb91d1146bfd11b1ad6be865e SHA-256: 79ea4d3e9d43ff5a67069f64c0aaf4b819ec0ffc125c540c56df1af297251855
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. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and the document's structure are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://xajibur.ru/award?keyword=system+performance+brendan+gregg+pdf+free+download PDF link annotation
    • http://front-glass.website/xumapofiwizu7l25l.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/a1jagjs/peppa_pig_golden_boots_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/ctWPxCl/22523081622.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/hjJhbfb/87566720744.pdfIn PDF document text
    • https://wazawuxara.weebly.com/uploads/1/3/4/7/134762715/8200581.pdfIn PDF document text
    • http://intereriia.com/843766703593qwss.pdfIn PDF document text
    • https://dasirexifavud.weebly.com/uploads/1/3/5/3/135320576/lekokad.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/vShfNDf/98217877996.pdfIn PDF document text
    • http://peludofnor.fun/rancilio_silvia_models58yk5.pdfIn PDF document text
    • https://cdn.sqhk.co/kumipexa/hsibtjd/best_slashers_in_nba_2k21.pdfIn PDF document text
    • http://topshops.website/high_frequency_words_grade_3_worksheets5l8d4.pdfIn PDF document text
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/lezopufiwugig.pdfIn PDF document text
    • http://arnautmebel.ru/61193180345hot5p.pdfIn PDF document text
    • https://zutujoxiker.weebly.com/uploads/1/3/0/7/130776667/zuzowej-rojapererad-kavotewoma-kezitukudatomix.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/waxapoz/31100785286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb37088-6090-438b-9ab2-58b26045d1b9/janitrol_heater_installation_manual.pdfIn PDF document text
    • http://wibofupenavoj.rf.gd/85702558140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6dd1455-f223-42ee-b24d-a109144e3d01/31918421228.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/pevewibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c90945-dbcd-4bdc-8551-5f5bad1bf751/2005_dodge_ram_1500_4.7_oil_change.pdfIn PDF document text
    • http://buvekixuj.epizy.com/how_to_work_a_rowenta_iron.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/15572019324.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/dance_practice_bts_idol_ilkpop.pdfIn PDF document text
    • http://kanisal.epizy.com/saborevafenadufufir.pdfIn PDF document text
    • http://zosatomoviwom.rf.gd/aba_model_guidelines_for_paralegals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d19dac6-e6a6-4ee9-90ad-1c0ddfbe88ce/45046733531.pdfIn PDF document text
    • http://zogutofarori.epizy.com/29414832120.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_off00016b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B65 5912 bytes
SHA-256: c4f67f764722e97f1ae7d52f15a285fb31389569755459d48782f31351f4e78f
font_01_sfnt_off00017f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F81 11336 bytes
SHA-256: e11cc5c454c6497ef670c761efd29cf611753c77dd1c9a63afecdc02b2e74742