Malicious PDF — malware analysis report

Static analysis result for SHA-256 498a22bd0702f601…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 05:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ddb9f430a024d252f3e29dc54e19b4b SHA-1: c1df120b0e9e6e2d0e690797a4e85c82bb860fb7 SHA-256: 498a22bd0702f601a859af1bbbd0e012be8ae904e174f5aa688d356049d257a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a high ML score indicating maliciousness. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=chess+piece+puzzle+re2+leon PDF link annotation
    • http://bufezipuduxev.mywebcommunity.org/grade_3_math_addition_and_subtraction_worksheets.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/you_are_the_universe_in_ecstatic_motion_tattoo.pdfIn PDF document text
    • http://riragukigud.scienceontheweb.net/14102056719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_60590a3921475.pdfIn PDF document text
    • http://haustova.com/mysejahtera_register_rm505mx18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_60238859c6ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403537/normal_60032cfc11432.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/palella_y_martins_._metodologa_de_la_investigacin_cuantitativa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_5ff960e360b6c.pdfIn PDF document text
    • http://mitedujonajezed.scienceontheweb.net/fewun.pdfIn PDF document text
    • http://bilabugova.iblogger.org/74159060476.pdfIn PDF document text
    • http://itdiscounts.pro/3850604568wt8i3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_6035d9b149889.pdfIn PDF document text
    • http://latatal.iblogger.org/unravel_me_sabrina_claudio_traduction.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/xijalovelokolep/xedewalipewubu.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/heat_energy_worksheet_4th_grade.pdfIn PDF document text
    • http://wosolebaxuwutux.rf.gd/apache_tomcat_8._5._42.pdfIn PDF document text
    • http://sanonusujinuz.rf.gd/raliwuvekenabifuzijaf.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/motorola_sbg6580_factory_reset.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 4896 bytes
SHA-256: e98cc3561582e74fa3efd04733818e8bf1fc5c82d265bfadb257dd65a21980cd
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 10868 bytes
SHA-256: e6544fc924e48b1403f79658357ce2e29ff16fa1d589aa471e2d2c1e80873633

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