Malicious PDF — malware analysis report

Static analysis result for SHA-256 52bc585954d4d6cc…

MALICIOUS

PDF

84.7 KB Created: 2021-02-17 09:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 52ba2f020df1d862c548917bb6788c71 SHA-1: 17463ad03d18dfdd545eac794d13f2648a7f4279 SHA-256: 52bc585954d4d6cc87ff969b4b996bc0f9891290ca86721ecc345d25029dd5dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or scam attempt. The PDF's structure and embedded links indicate an attempt to direct users to potentially malicious 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 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://crophysi.ru/wix?keyword=a+child+called+it+online+free+pdf PDF link annotation
    • http://se-mrush.com/99393525686j1gos.pdfIn PDF document text
    • http://hrushch.space/hymne_des_fraterniss_en_franaisnw9c2.pdfIn PDF document text
    • http://ozalupa.space/fefovazenuxzyf8a.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/stakeholder_theory_advantages_and_disadvantagespskk9.pdfIn PDF document text
    • http://noverst.xyz/layer_poultry_production_manual928md.pdfIn PDF document text
    • http://tevfikyuce.xyz/548646555122o8m7.pdfIn PDF document text
    • http://reduslim-officialsite.site/easy_voice_recorder_for_android_freel0ati.pdfIn PDF document text
    • http://firstdoctor.xyz/74176609927a6q6s.pdfIn PDF document text
    • http://tryraisins.club/chalkboard_template_powerpoint_freep1570.pdfIn PDF document text
    • http://mklhhhh.space/i_want_to_play_table_tennis_near_mesxj0t.pdfIn PDF document text
    • http://telgrm.site/a_little_history_of_philosophy_chapter_15_summaryr00kh.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/megulu/gifalivedabekozelonozuv.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/defufu.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/catit_water_fountain_manual.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_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 5056 bytes
SHA-256: f112f244285ed42933520198ae3be92f145beeca751a54a37fa243fbe4140473
font_01_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 10980 bytes
SHA-256: 8c076d83586ed36c6079dcd38b3a1970f0d11a027b7b1c639e780056971cd884

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