Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af2fd22117353d7…

MALICIOUS

PDF

76.3 KB Created: 2021-02-24 00:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9f3e3864f68314d872b07da65206c563 SHA-1: 36a69f6315e9ef516a93ef6f52721853f382ed79 SHA-256: 8af2fd22117353d75cf16ef0a52ddb80331094d7e50c1db86223d978cf2f50b4
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 detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The document body, though partially corrupted, suggests a lure related to persuasive writing, which is a common tactic for phishing or malware delivery.

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://maypoin.ru/123?utm_term=how+to+structure+a+persuasive+paragraph PDF link annotation
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/wumilelono_jorimubaxikal_duzokanokusefa_lulaturekiju.pdfIn PDF document text
    • http://asia.kiwi/monster_girl_encyclopedia_wiki_kobolduyax0.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/pibijesebademu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5feaeb9fb2648.pdfIn PDF document text
    • http://tradestaroffice.com/hubli_weather_report_livekm8bx.pdfIn PDF document text
    • https://luzibajaxu.weebly.com/uploads/1/3/2/6/132695572/begode.pdfIn PDF document text
    • http://sizijevoji.iblogger.org/17783896247.pdfIn PDF document text
    • http://xarusogu.22web.org/78365328431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://panadokopejed.epizy.com/jubig.pdfIn PDF document text
    • http://pomezup.epizy.com/bluejeans_recording_format.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/derecho_romano_para_nios_en_ingles.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_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 5276 bytes
SHA-256: 4243b0b078a600334393b33b081d0c56b1626f36028ae1a2239dc8bbbc7eb827
font_01_sfnt_off0001007b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 10800 bytes
SHA-256: a1b1cd920463e5bca7a12e48bbc452bbf731cc4a7dd74adce66363424a18d2d1

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