Malicious PDF — malware analysis report

Static analysis result for SHA-256 933280a48546774f…

MALICIOUS

PDF

75.3 KB Created: 2021-02-24 05:50:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 04391a21a06dda51545aeb5de44e24d4 SHA-1: 8e6203215791a6bfbb8dde7d1693edfea43cdeef SHA-256: 933280a48546774f14646ff6037b500a80c081bbe6cef4882b0172d8cefc4ba9
134 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure related to fake checks. It embeds multiple URLs, one of which is directly related to cashing fake checks. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/wb?keyword=can%20you%20cash%20a%20fake%20check PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484375/normal_601abade6a785.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5ffa93ca1c00d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_5ff4849d87c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464873/normal_601ca2cf95431.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/hbgeii2/breaking_news_royal_family_england.pdfIn PDF document text
    • http://firstsecu-paypal.com/jatutise5rvf4.pdfIn PDF document text
    • http://zokixofevuku.22web.org/71799747127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420612/normal_6014ce12e53ef.pdfIn PDF document text
    • http://losmopaka.site/arbys_secret_menu_area_51wfnv5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_6027fac812d40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374968/normal_5fe36a09c024a.pdfIn PDF document text
    • http://appless.space/fuvoxatoluryy27.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/what_is_the_emphasis_of_general_systems_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/firefox_browser_for_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/angular_4_template_form_validation_on_submit.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/irregular_past_tense_verbs_worksheet_grade_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 4784 bytes
SHA-256: 21c10b3a43ea1da33346324533d13a210c840f05a16ce9e05329012358c99ba6
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 10792 bytes
SHA-256: f7e623c6d2126700adae1ab7085cba354088fbf47087a2d2c5c8c410a5da001c
font_02_sfnt_off000111e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 4324 bytes
SHA-256: 8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd

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