Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb846e76e023aada…

MALICIOUS

PDF

79.7 KB Created: 2021-03-31 20:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4de4bbed02509b7c5c749ec471b5f304 SHA-1: b42a3febe960f1ff8c66be60cf82c3d687a4a438 SHA-256: cb846e76e023aada9d482f18c7121967e04eb24eb8a5003e416206c6e14aa0dc
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by heuristics as a redirector for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://crophysi.ru/123?utm_term=eular+guidelines+for+management+of+gout In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382414/normal_5ffe697dace46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444369/normal_600750fac1a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_604b19d343ee3.pdfIn PDF document text
    • http://woviregawafokal.22web.org/baxuxer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_6057b132e29f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_60146a63c6d14.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/pokixovuxik/66905141587.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/numuzevuzig.pdfIn PDF document text
    • http://likifekedita.epizy.com/grievance_letter_template_harassment.pdfIn PDF document text
    • http://tikilodi.epizy.com/56621903241.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/descriptive_comparative_research_design_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/indian_atlas_map.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/57405096865.pdfIn PDF document text
    • http://jofesowevelen.epizy.com/car_engine_parts_diagram.pdfIn PDF document text
    • http://sijuzoratimi.epizy.com/reflection_refraction_and_absorption_of_light_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/71066959135.pdfIn PDF document text
    • http://runugerobel.rf.gd/74175970261.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/what_is_the_highest_state_of_mind.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/what_is_an_example_of_disengagement_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/shadow_runner_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/functional_and_nonfunctional_requirements_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/project_igi_2_apunkagames.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/zavafimazewo.pdfIn PDF document text
    • http://semofif.epizy.com/74586454019.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/33159029484.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_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 5184 bytes
SHA-256: 76be921f42505d5e54e8a0bf444e3f79108bb0da92cd8af52241a44669868555
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 9972 bytes
SHA-256: 012926f4b7f5f7987127fa361a0990aa1b7de0e74e0e62cff281c1b3ebae1834

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