Malicious PDF — malware analysis report

Static analysis result for SHA-256 5543d33d620aa10c…

MALICIOUS

PDF

77.7 KB Created: 2021-03-23 03:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f762bfd66a4483b9dfdf9982961e2153 SHA-1: 4ec0a3c589aff85c7635d479e862d5dc8a5cd402 SHA-256: 5543d33d620aa10c294e9926e5575cf7e993fde6e09b5b4a3aae51bc2411cd5f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one specifically identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the presence of numerous suspicious links suggests an attempt to lure the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+addie+process In PDF document text
    • http://zozavelomidabi.scienceontheweb.net/zokoxezovim.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/sixowedofenabogabaxipar.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/2473645164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_603960efe2bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_6056744b7c0c8.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/62546739901.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/what_are_the_coast_guard_requirements_for_fire_extinguishers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414695/normal_5ff42d1d6c28c.pdfIn PDF document text
    • http://bet-info.ru/ingles_basico_para_adultos_gratisez35i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_60103a4b9f53a.pdfIn PDF document text
    • http://mukesuzovuvo.22web.org/95362407034.pdfIn PDF document text
    • http://gonzo-3d.com/15408234402qqb9x.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/how_to_tell_if_engine_is_running_lean_or_rich.pdfIn PDF document text
    • http://kopolade.22web.org/applied_science_book_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_60125836cba19.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/pulujolatepuv/percy_jackson_2017_cast.pdfIn PDF document text
    • http://babevuzax.epizy.com/3897683008.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/94975641381.pdfIn PDF document text
    • http://dapizodipe.myartsonline.com/79882845238.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/60079281439.pdfIn PDF document text
    • http://lipewolitaden.epizy.com/barriers_to_entrepreneurship_development.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/73298943033.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/polycom_soundstation_2_non_expandable.pdfIn PDF document text
    • http://zariwatanelil.rf.gd/2005_cts_v_transmission.pdfIn PDF document text
    • http://fawikinego.myartsonline.com/artemisa_planta_medicinal.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_off0000f263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF263 5140 bytes
SHA-256: 9bc377e5a23ca0c83fbb8f0fced453ad472b2ee2c51884ccd9c33e9fbdb2afad
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10568 bytes
SHA-256: 0b94aba5e4dc5e1145d5da5699b283f6ba94240bb5f7cb432e24004ad2b28be4

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