Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfd2db59c3ed474…

MALICIOUS

PDF

84.5 KB Created: 2021-04-26 17:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5691ef286a096e261a13818366f949a4 SHA-1: 841a44889a9a91bf2d1d40290374b7ec1a12ad45 SHA-256: 3bfd2db59c3ed474c19e6c0bea2600ab78dc660e7facdecaed4234145d1a3994
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'baarspo.ru', which is flagged as an external URI and part of a link farm on disposable hosting. This suggests the PDF is designed to redirect users to a malicious site, likely for phishing or to download further payloads.

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/strik?utm_term=mind+and+world+mcdowell+summary PDF link annotation
    • https://cdn.sqhk.co/melivetipi/bKXhgif/72189196967.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/blylefQ/revazi.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/hfjeVjb/tikiwezidajorapemuvo.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/diagrama_bimanual_ejemplo_practico.pdfIn PDF document text
    • http://fogugevup.22web.org/97022705424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0dc5fd1c-b354-4e5b-9ccd-45395e8994ed.filesusr.com/ugd/f79e8d_ed7f985446704c7b9b7c02f4b7e3c079.pdf?index=trueIn PDF document text
    • http://vipezirovopegem.epizy.com/bilurifeg.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_0ec9a4ee94a94520b77282e07ec7a240.pdf?index=trueIn PDF document text
    • http://vuzitugu.epizy.com/60485247808.pdfIn PDF document text
    • http://nomifep.epizy.com/mi_caballo_mago_english.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_30a354387b1e40c7ba725ea8ee033446.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/baidu_maps_english_android.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/pokemon_soulsilver_breeding_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/cadet_college_pasrur_admission_form_2018.pdfIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_8203ec10c7584604b56b21e2e178426b.pdf?index=trueIn 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_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 5284 bytes
SHA-256: 809db3780005013b5e54d7708fcb03902b496c006ce5936a848caf12936f7dcc
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10844 bytes
SHA-256: 807c632bdbcf77594186faec036f27a5341b1e3cd0519bb42e4248061f96c25e

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