Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eec53e321d26e07…

MALICIOUS

PDF

73.7 KB Created: 2021-04-04 14:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ad16398891b7c83fb9c9cc58ad2aa05c SHA-1: 4ff1a57848f8779f438d45c7f2d783f3489b10bb SHA-256: 4eec53e321d26e07c694a745c624f671480baa05a7ebfaa3e4649763af88f8a2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure and URL analysis point to a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=flight+sim+xbox+one+controller PDF link annotation
    • http://vetobiz.sportsontheweb.net/fipuwolodugekuwariwabuf.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/healthy_breakfast_smoothie_recipes.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/analytic_vs_continental_philosophy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415930/normal_60049a6d1d7e7.pdfIn PDF document text
    • http://senteber.site/judy_garland_have_yourself_a_merry_little_christmas_2_lyricswri8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_6009b00c548cf.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/flowers_for_algernon_short_story_questions.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/3333078717u9q9x.pdfIn PDF document text
    • http://reduslimitaly.website/tosisawukiguvire3zeyx.pdfIn PDF document text
    • http://vigorutijiwek.22web.org/quadrilateral_properties_matching_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_5fd9e0c03ece4.pdfIn PDF document text
    • http://kopogaxepaku.sportsontheweb.net/radepowirexitage.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/nitajosasa/28786828488.pdfIn PDF document text
    • http://soregoboredu.rf.gd/what_is_a_quantitative_correlational_study.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/81323785816.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/68572033503.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/dir-615_default_password_unifi.pdfIn PDF document text
    • http://luloxefisamo.rf.gd/rutedejujatos.pdfIn PDF document text
    • http://somizifiwij.epizy.com/20300509671.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/java_1._8_for_mac_sierra.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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 5164 bytes
SHA-256: 308724a0196fc2816fed98be691a7138dbf373352248f1d523a84c0baa1d3671
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 10576 bytes
SHA-256: 7b4d9ecfa0bbdffe88536c4fc3fc80a608fdd5d5f79dfef20f8b8e46629eabd7

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