Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b6cde517f6e8cb…

MALICIOUS

PDF

70.3 KB Created: 2021-04-23 15:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e51b0d7942f2a057cb64ea7bf79ced10 SHA-1: 5f8e18b62711add47acf98694211cdce61f59092 SHA-256: 44b6cde517f6e8cb89ef16f046624c1e492edf88958b615c9f975d5aa1c73a49
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=vtech+model+cs6709 PDF link annotation
    • https://zafeponatamixuk.weebly.com/uploads/1/3/4/3/134396017/3ead12dc.pdfIn PDF document text
    • https://wuwonerosetopux.weebly.com/uploads/1/3/1/6/131606808/a2cd5e2d0ad9a.pdfIn PDF document text
    • http://gadimikofeboto.iblogger.org/21650801879.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/1080090.pdfIn PDF document text
    • https://xogowabixebeva.weebly.com/uploads/1/3/4/6/134612916/7954948.pdfIn PDF document text
    • http://prodive.su/dark_souls_wiki_solaireeo3u7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476927/normal_60410a5bc4aee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fc9f6a1cfeff.pdfIn PDF document text
    • http://setlyb.online/basic_accounting_interview_questions_and_answers_for_freshersktj1y.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/dopeduwenon_vimoxeditofa_xuzumuna_goligew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_600068a7d2c7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_511c646c62224e0080ded7472b5c1103.pdf?index=trueIn PDF document text
    • http://putesedesupelo.epizy.com/license_agreement_intellectual_property_template.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_51dfff044bd54768bcaf777580fa9eb3.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_dcedcae048b64c1f99a8b5996f23d225.pdf?index=trueIn PDF document text
    • http://mowoled.epizy.com/39530785097.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_8af4b38f9dc040868a94673a947faa5f.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_06d0f884f1b6400ca5f6489b2cac14bf.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_a3b6483782094aeea326ef1a620fe183.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_86c702cd86034f28ad2875c6bd54fb87.pdf?index=trueIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_af0a2fae518a4bdaa60bdcd8bcd3137a.pdf?index=trueIn 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 5372 bytes
SHA-256: 89f61efcb9c541de08d9377d793eb20858e44d44269599603672fc65984739ad
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 11160 bytes
SHA-256: 12f73fc5413eda3f1104bb832aeecca5cea7586d3b36cd4011da9b834b83b527