Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0508f398cb8d1c…

MALICIOUS

PDF

65.6 KB Created: 2021-02-14 19:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5c9c93b58eaad23a49ae95c4dcbcb101 SHA-1: 65ea44a3021ab8591ccad0d595a335f3c78714d6 SHA-256: 4f0508f398cb8d1cca073f16ca96aa757a436b6ecd67b107be2f1e4480ca389f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malicious redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to lead users to potentially harmful sites.

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 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://druttle.ru/wix?keyword=autozone+dress+code+apparel PDF link annotation
    • http://metazoaapc.fun/greatest_hits_of_the_90s_playlistttxj6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_601be0de8c3b0.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/pobibafa.pdfIn PDF document text
    • https://cdn.sqhk.co/wifepodilojo/PVQhhhg/siximetef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451035/normal_5ffa5910b5794.pdfIn PDF document text
    • http://cancandance.org/i_will_eat_it_all_upset_stomachxlvxl.pdfIn PDF document text
    • http://hangookoil.ru/anandam_malayalam_movie_video_songs_free9bza8.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/nufidibodudulad/chiefs_injury_report_friday.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/gotabetezejamopepero.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/felaguzetotadovojusujina.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/zasowedegubixusixaxoxot.pdfIn PDF document text
    • http://joxegav.rf.gd/akhiyan_ne_rona_le_liya_song.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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 5108 bytes
SHA-256: e13e30f83c84549ed1edb8a823622d30a7b471004bdceb1c61576166d963fac3
font_01_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 10116 bytes
SHA-256: 5e109162610a96680c1833bb5c0bf2e7b190790c4ecf718d2671d17510d200d1

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