Malicious PDF — malware analysis report

Static analysis result for SHA-256 159905f545377663…

MALICIOUS

PDF

73.0 KB Created: 2021-02-22 09:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27e11ab79b4bcf41142df2673c56410c SHA-1: 923fd32d86ed45136fd4535625e126ae840d0c94 SHA-256: 159905f545377663a3eb7dcb1b4061284e3975f012909b6376e2a6b4458bb1bd
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/wix?keyword=newman+projection+practice+worksheet In PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/92f3a171.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/Jgjhiib/mine_survival_apk_award.pdfIn PDF document text
    • http://nowemuzasam.22web.org/pathologie_de_l_appareil_gnital_masculin.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/ILhjgdj/66764965591.pdfIn PDF document text
    • https://cdn.sqhk.co/jujifefa/bAiHxlY/23138610330.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/hahdiaQ/top_selling_song_of_the_90s_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/heb6ibW/37678200299.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/jiGth4n/magic_school_story_cheat.pdfIn PDF document text
    • http://wenamifub.22web.org/4566200969.pdfIn PDF document text
    • https://cdn.sqhk.co/tagubutapa/jMVrihp/28677578933.pdfIn PDF document text
    • https://poxanada.weebly.com/uploads/1/3/1/4/131483305/7607548.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jamebixidi.rf.gd/medical_terminology_a_living_language_free_download.pdfIn PDF document text
    • http://fufinekudag.epizy.com/gimupumafilexukulabofif.pdfIn PDF document text
    • http://ratazudawi.epizy.com/jamia_b_tech_online_form.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_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 5344 bytes
SHA-256: 06ef66dc7a79ec7f0e6d367d5bd6294ee3bd5bdfc1847a71cc48b504b175da5f
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 10444 bytes
SHA-256: fc39850acbb356d631ed763fc3560c2ab4d7012ea787ce251070d154cb2e6e53

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