Malicious PDF — malware analysis report

Static analysis result for SHA-256 4321545b23f565b7…

MALICIOUS

PDF

77.6 KB Created: 2021-05-25 02:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06e8fb340aa777d5b61fc35777df372f SHA-1: d517e1f9addadbacf6f6e353dbe12cfd354c5d2c SHA-256: 4321545b23f565b78241583ec30ddad8927aa47c1a23f61e187deab6ebd4b56d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The primary malicious behavior identified is a large number of embedded external links, many pointing to other PDF files hosted on various domains. This suggests a link farm or a distribution mechanism for further malicious content, rather than a document with legitimate content.

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 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.
  • 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://static.s123-cdn-static.com/uploads/4420906/normal_5fd07fc6853d8.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_6068992ff0a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5ff4fd22de2f1.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/4977740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601e021345b6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_600021590dd2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489263/normal_600de5185a9c6.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/rudedutu_wuwip_piramurizeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401982/normal_5fd06eb9ae952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451376/normal_6033ff876de22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_606eaacf0c117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_6041549e256bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_6053b3e80e773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5ffecdefd9630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_60523566bc86e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379046/normal_5fdd67dc9ecd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=how%20to%20write%20a%20belief%20statementPDF link annotation
    • https://uploads.strikinglycdn.com/files/e01f9063-7b0e-4f92-a96b-4ee4704f2f84/lipijevireginas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f813c89c-9756-400b-b5cc-94939d029771/how_to_connect_canon_wireless_printer_to_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7205a5-4b75-402c-832b-27d8a700b046/what_is_the_main_message_of_the_lorax.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_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 5108 bytes
SHA-256: 6d39358f4fdbd3ebbc241316f5decd618b8d7f32f77dfb1ffcbb5668edeb5f5e
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 11256 bytes
SHA-256: 9caa9d63f9fc026f95731c35c87657bc4c553b7e1948538ba85dd6afbe0031c7

Open this report in the interactive analyzer, or submit your own file for analysis.