Malicious PDF — malware analysis report

Static analysis result for SHA-256 10552c52d5888b0f…

MALICIOUS

PDF

70.3 KB Created: 2021-03-30 23:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09441bd99774bc61633e0b3df6a3cfd6 SHA-1: 74227dda3c22a97f690bb5571a2d3caa13f4450c SHA-256: 10552c52d5888b0f9294245e0c206d7915aca757fac1b0e038f88f09b6d54395
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=ap+psychology+chapter+1+test+pdf
    • http://hookup157.site/886368377dy2fa.pdf
    • http://tanolugulutewu.medianewsonline.com/93136908469.pdf
    • http://nisodur.iblogger.org/votidaruf.pdf
    • http://favunewesazut.sportsontheweb.net/56118425614.pdf
    • http://xoxapepagaxon.mypressonline.com/limilibikinopimaf.pdf
    • http://texno3ua.com/altec_lansing_life_jacket_2_wattsggm2t.pdf
    • http://takipleskazan.org/authentic_happiness_by_martin_seligmanet2ec.pdf
    • http://lojapidabud.mypressonline.com/que_es_un_titulo_de_credito_hipotecario_negociable_peru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mevabifutaxepag.epizy.com/gedera.pdf
    • http://nipugizanevowo.rf.gd/lulabo.pdf
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_f90ea9cca42e424eb0f8b4bc6132564b.pdf?index=true
    • http://zikinevubebera.epizy.com/nofejudavasiragopegadide.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_edbc52bfac9a49d6a039fe3244bcb793.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_16ecebe354a543049364bcceeb2862ee.pdf?index=true
    • http://dojafeduzig.myartsonline.com/aspen_pims_manual.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_154d5fef59774c74879f4c65dd3aff0a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bab255b5-76fd-4021-a11f-7a99c3262c9a/92259738985.pdf
    • https://uploads.strikinglycdn.com/files/9d530add-d339-4cdc-b81d-dd914dd3e13b/finegufutokalas.pdf
    • https://uploads.strikinglycdn.com/files/7a339644-f90e-44e3-914c-6dfb97913738/premarital_counseling_topics_christian.pdf
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_e6cb8bee3ac94355b75d04a256ab3152.pdf?index=true
    • http://zobovobewuw.epizy.com/template_blogspot_magazine_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c3.bin
cfd23f5cfb0eecc2190e14ccbdcdb88a2eb1ccaffe8380ff6792128e01214ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 5560 bytes
font_01_sfnt_off0000e7b9.bin
7aa55c9c1f21b5e176c54753ad6abf49274b1c5f91086b0c093bd4b7f1ed36b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 10632 bytes

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