Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66f5ea03d7a15e0…

MALICIOUS

PDF

71.8 KB Created: 2020-12-26 14:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c7c6819651b523ed8303a840116917f9 SHA-1: 52da2819ec526ae1d065d5d9e1af55b014dbf40f SHA-256: d66f5ea03d7a15e09508e2040ef277b84db0f65cb6c6b8c4325bdfd151ec48be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic to direct users to malicious sites. The embedded URLs and the PDF structure point towards an attempt to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/123?utm_term=wizard+of+oz+script+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fd10cfe98f41.pdfIn PDF document text
    • https://cdn.sqhk.co/domuduxuro/ajevDhh/ralphs_hours_of_operation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5fc6018110adb.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/0icjkUC/couple_ballet_dancers.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/kiwimor-genot-dexeroj-pisowakexi.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/dinisemowoge/pexivegomunelefif.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/ib_extended_essay_bibliography_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/39000444219.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/acrylic_sheets_for_laser_cutting.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/67023013764.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 5180 bytes
SHA-256: 04e25b37b7ddd5c3bfa0eaa4401ba2939b41e7bd1e9a6b7340241247d49be631
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 11336 bytes
SHA-256: a91b420084bbf50f6633a1d7ca301926bcf906b81036c5ff1ba630e3e077cb9f