Malicious PDF — malware analysis report

Static analysis result for SHA-256 2409442e94b164c9…

MALICIOUS

PDF

72.8 KB Created: 2021-02-11 19:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1202dc8b3f77e025a54bbcc8562a1b52 SHA-1: 051f8d1fb93a4ea510386e7fcdfd12ae07c9aa2b SHA-256: 2409442e94b164c995dd4f84694c9d47667a8dfd4aa6f3051cbdb06932f7cbb2
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on suspicious domains and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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
  • 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.
  • 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/wix?keyword=physics+workbook+answers+class+10 In PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/9661491.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/tigekapoforiwi-goxaniwokofexi.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/4b890bffa95a74.pdfIn PDF document text
    • https://sufunisukexe.weebly.com/uploads/1/3/1/3/131381546/wupiras-jofobimotaxija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_60106669e118d.pdfIn PDF document text
    • http://dkshlyap.ru/rexepenetav7zuqt.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/c3d2a718ae.pdfIn PDF document text
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/jitusugutizidawus.pdfIn PDF document text
    • https://debugifepini.weebly.com/uploads/1/3/1/0/131070476/sejives-vefagi-xavilasisu-fujowevap.pdfIn PDF document text
    • https://jotipipadazazo.weebly.com/uploads/1/3/4/3/134319758/7e4add44d1.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/tinajabizoreguf/chief_information_officer_roles.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/electron_configuration_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/gadekukev.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/frontier_fios_channel_guide_tampa.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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 5480 bytes
SHA-256: 9ec8de9352ca61d62d7b940f15e979d6fb710ec662d93c46e59f416112d2d889
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10156 bytes
SHA-256: 7847920cd807cd88f79d96909974ceaf89017f8c1a78b673747a5523b86c4f32

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