Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c3c72c36321895…

MALICIOUS

PDF

112.0 KB Created: 2021-06-10 13:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5a061a477525bed21fde86d537ac8fd SHA-1: edc58153d21b2116393b520f6911bdee93284b2a SHA-256: 39c3c72c36321895f42aa7e8c9a9aafc63d33f097d76423e799f970c5b4c201e
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 0.9993

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://pixomot.ru/pbw?utm_term=chicago+musical+script+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467318/normal_6027a3e324c72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393521/normal_5ff4d08245431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_6031487c053ee.pdfIn PDF document text
    • https://jixevugoxoxeme.weebly.com/uploads/1/3/4/6/134625980/3466b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_60016d72d8c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_601601f36b20d.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/kodotifopifapafe.pdfIn PDF document text
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/e63097b463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418013/normal_5ffba58ccb0cf.pdfIn PDF document text
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/vuzoxetasikivakekuvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_60b9a11040e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473619/normal_606d1088d6060.pdfIn PDF document text
    • https://pusigodumutujor.weebly.com/uploads/1/3/4/6/134610993/4483566.pdfIn PDF document text
    • https://xekijepomi.weebly.com/uploads/1/3/4/5/134508866/254e39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_60187e5aa7b2f.pdfIn PDF document text
    • https://gubipixuzubuf.weebly.com/uploads/1/3/4/0/134016682/41960.pdfIn PDF document text
    • https://gapudozesaneg.weebly.com/uploads/1/3/4/5/134525911/5136042.pdfIn PDF document text
    • https://sekowuwumobof.weebly.com/uploads/1/3/5/3/135394032/59cd63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorunezagu.pbworks.com/f/your_lie_in_april_anime_plot.pdfIn PDF document text
    • http://nagomax.pbworks.com/f/what_is_an_isotopic_abundance_in_chemistry.pdfIn PDF document text
    • http://wusagem.pbworks.com/w/file/fetch/144439578/86507802794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4760e6-fa27-44c6-81f4-5055c42e3b38/35495671052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3706b4bb-71ef-4940-96ee-28cd93f7fc90/60102813018.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423399/15552984218.pdfIn PDF document text
    • http://radejaki.pbworks.com/w/file/fetch/144767076/psychology_12th_edition_myers_dewall_free.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_off0001765d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765D 5476 bytes
SHA-256: f644dbc3a0eb373d4fc6ed106ded73ee37adbc1a506b5bd8d463c297057b5d49
font_01_sfnt_off000188d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D0 13000 bytes
SHA-256: 1beffac32aa8c3818b88fb7c854780f78700d08c4cd5daa02d00950fb563f426