Malicious PDF — malware analysis report

Static analysis result for SHA-256 52078cddcec0d13d…

MALICIOUS

PDF

67.8 KB Created: 2021-02-14 06:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37ecd2512cb340c426a136e3bd7aa368 SHA-1: d88e5452d854dfa5a1561be0ee2bd5938f557ecc SHA-256: 52078cddcec0d13d2e89bf3bf47c95bf104bbcd5cc5be8359394a8463a1bc55a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://baarspo.ru/123?utm_term=its+getting+hot+in+here+lyrics+glee', are likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or malware distribution attempt.

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://baarspo.ru/123?utm_term=its+getting+hot+in+here+lyrics+glee PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420586/normal_601d840fa56c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482228/normal_5ff9ec8f1f254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_601be0d31af48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_601359a8210f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_601db0e59972a.pdfIn PDF document text
    • http://fruit-ital.space/five_points_towards_a_new_architecturejhtza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367278/normal_5ffb0e4140fb0.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/half_yearly_exam_2018_english_answer_keyk6u09.pdfIn PDF document text
    • http://megoribituvu.iblogger.org/x_files_theme_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448110/normal_5fdbc8016ed8d.pdfIn PDF document text
    • http://opticsystem.website/jiwefavisaxifetujas7dra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_6024516ed88d7.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/cieWge0/pixlr_free_photo_editor_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuxivupinamipi.rf.gd/filum_anelidos.pdfIn PDF document text
    • http://kiwaxujunexozet.epizy.com/bilikubufufipekire.pdfIn PDF document text
    • http://genapixej.epizy.com/free_printable_calendar_templates_for_mac.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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 4888 bytes
SHA-256: f4192c6b6cbf93e78c94eb7f34d45992c13be8689be90230a1f207de5d14c98d
font_01_sfnt_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 10184 bytes
SHA-256: 767ab2daa974ef2896ffed552cd94a1931967a097ab258c4244f11ec88c851a2

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