Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a974ff279e0c69…

MALICIOUS

PDF

72.4 KB Created: 2021-03-25 07:54:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc3dff334312b264dbcc716366249946 SHA-1: ae3577815794adf02f07cf015e4b1e36bf79daeb SHA-256: d9a974ff279e0c69a32399987d5615c608da98dca81578a13e0a7b3fc7c66c45
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/wix?keyword=spanish+possessive+adjective+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489056/normal_605a28374b7d0.pdfIn PDF document text
    • https://mufebomilizupa.weebly.com/uploads/1/3/4/6/134608191/miwutaminixoso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_5fe7daf4cfb90.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459321/normal_6002723d79677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369322/normal_5ff5712f6b0d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5fe2c2564d696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fdf99be9bbb9.pdfIn PDF document text
    • http://xekaleduwam.iblogger.org/45398856939.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474220/normal_5fcb5541557c1.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/26da791019d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409405/normal_5fe7f9f95aba3.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/1b1f9560-81b1-4c3f-a676-9521373490a1/36996651389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adbbd092-ad97-4e52-8740-d351df6e0d3d/the_hit_girl_full_movie_online.pdfIn PDF document text
    • http://tenumexodopim.epizy.com/curso_aprendizajes_clave_segundo_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbab900-88a3-49fe-b5a8-b5817997414e/48136180671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c091e8-1473-4193-8411-6c4b52abe366/melhores_livros_para_jovens_de_18_anos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6da149d-4de6-4553-abed-59fc0010dd5e/61455491753.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2daf0fea-8bee-4c23-8c97-6e98941c0d5c/26479083435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e71d25e-07d1-4384-a1f0-fccf432af1ec/linear_ld050_keypad_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0ba64e-8f98-4128-99c7-25a7b2292500/baxiwonokezel.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/divod.pdfIn PDF document text
    • http://debagejusuwaj.epizy.com/78469006077.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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 5524 bytes
SHA-256: 41d56a86a93ee35a5a9a43a0eba040339d029f1776924e831a96bba3a818cb69
font_01_sfnt_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 12232 bytes
SHA-256: 588353c9996a276a8842f456ffaab3d625c74f386049199fb474264feed06757