Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bc5b64940b9b3e…

MALICIOUS

PDF

75.5 KB Created: 2021-01-29 10:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d8ad76f2c0b2319b3fd7746d76baaa6 SHA-1: a5d29f8a5ed4c2bb9b15bbdb9e50d4f7d7654b24 SHA-256: 81bc5b64940b9b3e038196f5601cb9f9a28306d9d2b956f3d5cf93a305efa078
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to a dictionary, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/aws?utm_term=complete+dictionary+of+synonyms+and+antonyms+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424645/normal_600744d6a1dcd.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/lumojin.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/fenubipedet.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/pumasogupupedevin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476758/normal_5fe16c9061dce.pdfIn PDF document text
    • http://kigazuvunawolux.iblogger.org/notexijawuveb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477878/normal_600133f14e419.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/ZjegcKx/world_chef_academy_free_courses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5fe458afddee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fff9d22c7b71.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/6929826.pdfIn PDF document text
    • http://wipababotuzuke.iblogger.org/91498218464.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/fSVOjcP/tvd_quiz_sporcle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://leduvusiluvev.rf.gd/full_size_fitted_sheet_deep_pocket.pdfIn PDF document text
    • http://wotolag.epizy.com/toriwodubejuxijakizu.pdfIn PDF document text
    • http://jometuxinuvalal.epizy.com/76360485366.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/dowaxoj.pdfIn PDF document text
    • http://giduzorim.epizy.com/joining_report_after_training.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_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 5308 bytes
SHA-256: de6edc9c49974d9cf72002e3c22713248e8f58341c89357941c4f1f2185afe31
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 11104 bytes
SHA-256: 01a061f116d0bdb62f41bd3a6cdbeaf04189d21e7049301426cdc9d176a0457a

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