Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3298719265d1d47…

MALICIOUS

PDF

76.1 KB Created: 2021-04-16 02:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cdff987d97880098db7fc46db7429d61 SHA-1: d19490416484f7f28980dea229954fc2b2aec73a SHA-256: d3298719265d1d4730d25b4c8f727ccd2d0085ec3d53604dd3a2e3d67a78391e
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The presence of these links suggests the document's primary purpose is to lure users to malicious websites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=i+love+my+books+theme+drawing In PDF document text
    • http://wotaxatumumodok.sportsontheweb.net/sijiribewutaxedomibiwiga.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/11021876813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603caa3df11de.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/how_to_ensure_validity_and_reliability_in_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_60313ce2efad7.pdfIn PDF document text
    • http://sekujirimabasas.getenjoyment.net/5915344086.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/LVgdhcg/84587151135.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/jbmjjgh/sumibafujigefusawari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5ff19d24e95d4.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/86578947786.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/xidulumexi/kegiwelonumusalajigog.pdfIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_599efcd5b7a54587b9eb1b3999808ce4.pdf?index=trueIn PDF document text
    • http://pimokizogo.epizy.com/viki_korean_drama_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/tawipigowu.pdfIn PDF document text
    • http://beganiwalegujas.rf.gd/jaundice_in_newborn.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_da68e8319c20436ea61cd16a98480a56.pdf?index=trueIn PDF document text
    • http://fewebife.rf.gd/zamenabedupigu.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/rb_leipzig_fifa_19_career_mode_guide.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_86a992cdeaf445b99245f8094de4900d.pdf?index=trueIn PDF document text
    • http://gidobiladuk.rf.gd/blood_relation_practice_questions_with_answers.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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 5632 bytes
SHA-256: b3b57c30da89bc3128ded37cbac39ecb7ee430e944b72a2d826b73bf68b2cf2a
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 11148 bytes
SHA-256: 7b777a933a97cc0e8b17c55b93738342b8818fae7d4a97618eeb0b0e99b78c84

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