Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5d2dad40564b6c…

MALICIOUS

PDF

73.0 KB Created: 2020-11-10 18:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 73c94db68ea1bbb6b7e583dedcbee9a7 SHA-1: d43c4919585deeafae9cc27569af524e8b847d6b SHA-256: 1b5d2dad40564b6cc486670c18777f96086f2b07e1401e8fa3fb735d14c53711
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Weebly-hosted PDFs, and one critical link to a known malicious redirector. This indicates a likely attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier and ClamAV detection strongly support its malicious nature.

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://traffking.ru/aws?keyword=texas+gold+cup+sugar+land In PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/08b3c9.pdfIn PDF document text
    • https://nonudefetug.weebly.com/uploads/1/3/4/3/134314303/tixemavelupejor_jotilo.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/zomijawuborubafugod.pdfIn PDF document text
    • https://tibaxefuxi.weebly.com/uploads/1/3/4/0/134017075/rarusefakujat-velofegokisa.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/3474916.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/bipagefe.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/belem.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/garorowa/bulis.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/fozafipizotibukogusa.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/azure_devops_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/nesco_vs-12_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/ge_stacked_washer_dryer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/xidasaxefofijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30917b81-afd4-43b0-a34d-540c2a4f213f/vizio_d24-d1_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db78bec-0739-47b2-80f4-26ca27749876/pilov.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/39698544654.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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 5256 bytes
SHA-256: 693f4852119194e3ccd5d6b314141124ee28afaa09b61f4bbe6f28fe16b70199
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 10408 bytes
SHA-256: 8002691abf22e37a46c60bf462e16729e04327009053b2ffba1f5136900da282

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