Malicious PDF — malware analysis report

Static analysis result for SHA-256 de36f5cd5f2912c0…

MALICIOUS

PDF

70.7 KB Created: 2021-02-23 16:26:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 74a284ecb62d6fb6e9606d14eb33328a SHA-1: 9b4fee0e32f11d005c0bc5f9220a1c2121d1608f SHA-256: de36f5cd5f2912c0d97ba808d6f890ad9de9c8d47c93986ffd62a9a414395d28
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and one prominent link disguised as a movie search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://jacksth.ru/wix?keyword=watch+the+hunger+games+catching+fire+full+movie+streaming+online+free PDF link annotation
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/refubejiwajilevipe.pdfIn PDF document text
    • http://nujuxogo.iblogger.org/1606116073.pdfIn PDF document text
    • https://donezuzigomage.weebly.com/uploads/1/3/1/4/131438278/nosutowovu.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/savukojubusum/avg_anti_virus_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/southwest_airlines_carry_on_size_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/berliner_platz_1_neu_dvd.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/assassin_s_creed_identity_apk_mod.pdfIn PDF document text
    • http://vanabigura.rf.gd/23179197435.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/96053075587.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/guardian_university_guide_2019_history_of_art.pdfIn PDF document text
    • http://joxojivanajixuj.rf.gd/41001597342.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/zuzalanis.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/andy_serkis_theresa_may.pdfIn PDF document text
    • http://pavunununege.epizy.com/25647048602.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/gapuvodo.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/96441136435.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/38156613712.pdfIn PDF document text
    • http://sizatopus.rf.gd/carpenters_gold_greatest_hits.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/insidious_2_parents_guide.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_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 5368 bytes
SHA-256: a83c7e4e564850a480ce892d08675a3b1fd070901776dd7c41d72ced4cf2194c
font_01_sfnt_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 9988 bytes
SHA-256: 673f720c5b83a581720587509b1295df4b239f073f5658ed4527136391f7ed8a

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