Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b89739fd7ab285b…

MALICIOUS

PDF

66.2 KB Created: 2020-11-20 11:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 55009c98b0fc23a673d76b9015840cf2 SHA-1: caead6db6bc2a633993c1d2b7349edb27d2d6aeb SHA-256: 9b89739fd7ab285b441e47639331a9340fcd83a11e83bd3c010a7e01c76c3e57
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF structure suggest an attempt to leverage link farms for SEO manipulation or to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ggtraff.ru/123?utm_term=international+outlet+adapter+walmart In PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/lawijonefasav_kujakarenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f921f71-6a21-4dd3-9336-2cc09d4b432b/ygs_matematik_temel_kavramlar_yaprak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad07d92-304f-45af-9460-aa7c016d8918/51905329130.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/dodgers_score_friday_night.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0715cd13-17a1-422a-8dc2-ed63e3026ae8/40271648333.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/63522749923.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/amc_12b_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/lakusekukareretit.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/ap_physics_barron_s.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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 4956 bytes
SHA-256: 87bf0f67bb423f6b7b5d259258e6dd4c194819a7f714bb2ea6c9804b715618fd
font_01_sfnt_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 10380 bytes
SHA-256: be18688af7645a55182e8c1fbec03ab956b6b34f0b51c9985599c32719c78238

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