Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28da95488c3b8ad…

MALICIOUS

PDF

87.9 KB Created: 2021-02-27 22:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e71f5ecb4e39094a8aac8065fbb97dc3 SHA-1: 29b02d614702f993f0270db6c5519c81e5f898fd SHA-256: d28da95488c3b8add338da9e783e8a4dafd9d56a94683ddb4ae65f4e72e4a369
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a book search, directing users to a malicious URL. The ML classifier also strongly indicated maliciousness.

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://midufefew.ru/award?keyword=the+memory+book+harry+lorayne+and+jerry+lucas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450145/normal_602de3aabd477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_602c7ce4bcd3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvivemu/nieUibU/lomusunukorurapim.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/ZFzhejd/murevubabozuwasusevu.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/badshah_movie_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tiviluluje/iu2jM00/bunny_empires_war_and_allies.pdfIn PDF document text
    • http://com-servers.online/wigapisibexosepe6c4ty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_6038026e16bd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455901/normal_602641cba1c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_6020a51dc5a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fde7c5e24754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_601b35926c92e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fifomivosa.rf.gd/rotoxibefasexavitabavujax.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/41847661384.pdfIn PDF document text
    • http://latuwukatagowa.epizy.com/half_life_calculations_2_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/bishop_heber_high_school_uniform.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_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 5728 bytes
SHA-256: 4caed9c8259c10f6c3def2bc068803e39d7aac77b88ceaea5bd6d645a0ff32ca
font_01_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 10972 bytes
SHA-256: 5f34ee18c03a9d703d9229544f7942586256d1f7b22ac912c31c15f4121067bb

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