Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aac9f8950da5017…

MALICIOUS

PDF

77.3 KB Created: 2020-11-10 12:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ac73aa18ca5df7fcb076640da81fa3d6 SHA-1: ed7e80229cef9cda5320c38193e458f68d301ea0 SHA-256: 8aac9f8950da50178ee3853f6333f3ca0fd9e0fefa2f6a56cdeedfdad44f50be
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URL 'https://traffset.ru/aws?keyword=empi+select+tens+unit+manual' is a primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?keyword=empi+select+tens+unit+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f9247709a7bf.pdfIn PDF document text
    • https://zajasonasijo.weebly.com/uploads/1/3/4/6/134627958/rofusubusakon_xivifa_soxedigidofudew_toput.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367312/normal_5f874b447f2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_5fa805e77d1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f914a65a7fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369629/normal_5f8ca5d5a599b.pdfIn PDF document text
    • https://jirixakevafu.weebly.com/uploads/1/3/4/4/134404576/87b334.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/gelawiweza/makipavij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/175bf5cc-1b03-491b-b81c-e82e9d3783b8/when_we_were_kings_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8fa537-ee75-4a98-b1a1-9dfd50c9d66f/38082080027.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/77623539430.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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 4940 bytes
SHA-256: 5fdb63b7ebdd321c795a6e98d1e2fad173313ee4b9afc1e9e08e90021dd5c9cf
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 11496 bytes
SHA-256: 280f9839899a892db24e3c514028b0862e1fc5e1dcda03cf64901d13023fb142