Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cc91ee0e64acf4…

MALICIOUS

PDF

59.4 KB Created: 2020-11-14 19:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f043d4bc9cc762e2357299a3b2dc5c0f SHA-1: 9de7eafc4ba19ff9358dc96dd49344535e1affff SHA-256: 03cc91ee0e64acf4e57356a404f0f1c797f409c458a57a5138e6b5ef849c62c5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/aws?utm_term=coronation+street+tv+guide+this+week PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f87b5c3cf36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_5fad2da1a055f.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/jidewil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369645/normal_5f89351bae272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_5f981a1223883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403805/normal_5fa8038eb30d6.pdfIn PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/497606553b.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/leguvefu/amie_examination_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/sociopath_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/business_proposal_writing_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f4ec5e-926d-404a-b306-800738543373/someone_named_eva_book.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_off0000ac00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC00 5176 bytes
SHA-256: d966abec859bd318f3db5b222f5a034dea372531bb859ce8952ca08879c97076
font_01_sfnt_off0000bda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 10316 bytes
SHA-256: b8c6e242d52d78561a0d385c55e6d19933cef33c2a1d32f1f34703b6b30cdb5f