Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ab8b5e08efa5d1…

MALICIOUS

PDF

66.6 KB Created: 2020-11-10 18:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9e89cb9dd06a906d3bae20dfddf76ff2 SHA-1: dc1d1e895762444404525795e660da09fac2f015 SHA-256: 42ab8b5e08efa5d129aa0b443264c3eb3cc3f9e4970b0f1220f4f634dcf45008
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 0.9995

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://traffnew.ru/strik?keyword=focus+on+nursing+pharmacology+8th+pdf PDF link annotation
    • https://bagexefegaluja.weebly.com/uploads/1/3/4/3/134393574/16f1ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f8b60810eb63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5f8e2b2fd3918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fa8ca1994b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f899b7ca7ee3.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/deadbd7f-0758-45a0-a345-3c37173b9515/fakezakafonogevotexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac030d4-df0e-4f10-a3b8-46bc4c0e8403/zetugovasor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995adc3d-ab35-4b25-9ff4-57ff1d91ba06/1822431730.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/kathy_schrock_guide_to_everything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bfca1c-980c-424a-8743-bfd3daa78d2a/22057098991.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_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 5820 bytes
SHA-256: d3808d0c6e8c6c873eee5dc1490c6191cff2295f45f07fd7691534e53d6c9e13
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 10320 bytes
SHA-256: 9d738bb2d40e562c5d36902202a873ad31837fa4ee13b0444897b6b5ec5c6ac8