Malicious PDF — malware analysis report

Static analysis result for SHA-256 58cdb27d64ea66b6…

MALICIOUS

PDF

67.5 KB Created: 2021-01-24 22:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2593a76b3879fcf6632b3fe845337065 SHA-1: 90c3dcc407772da59fec8d427b720f9dbc212e1f SHA-256: 58cdb27d64ea66b6c40356ff127cc753bc45038dd3bc9046612fdf66af315778
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 maliciousness. It contains numerous embedded URLs, with a significant number pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is to redirect 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/123?utm_term=little+things+chords+jessica+mauboy PDF link annotation
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/4695053.pdfIn PDF document text
    • http://gufutaca3.xyz/45356513331om1m3.pdfIn PDF document text
    • http://nuxuxavolas.22web.org/cheat_crash_bandicoot_ps1_android.pdfIn PDF document text
    • http://stal-kemerovo.ru/carpet_steamer_home_depotqvx82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369522/normal_5ffa4f414ec75.pdfIn PDF document text
    • http://goodnaturak.space/bejagisemi7sp.pdfIn PDF document text
    • http://netzamka.ru/battle_of_sea_pirate_fight_hileebzlj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisebot.epizy.com/galaxy_note_10._1_android_9.pdfIn PDF document text
    • http://gusubozavagu.epizy.com/bully_for_android_apk_mirror.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/barbie_princess_charm_school_uniform_costume.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/89744960890.pdfIn PDF document text
    • http://xukenefurirog.epizy.com/chhattisgarhi_movie_kaise_kare.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_off0000cb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 5612 bytes
SHA-256: b560b5d7d83479e0ed4cf67cbdbb89ef80db9482130606d9c9453abcbb58ec3f
font_01_sfnt_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 10116 bytes
SHA-256: d3d6d4091fdbd7a9e416fc89709bae8347f4ce56606bd93b5b355fffa26a0c67

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