Malicious PDF — malware analysis report

Static analysis result for SHA-256 887df1287951ad3f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-25 14:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 011648a3611739cbf4455087a00823d7 SHA-1: 2e477929262274158f6a1aaa74e1229bdb09eee0 SHA-256: 887df1287951ad3fe95767826456bec1b3a861582add59a436a1dbcaa52fb825
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a URI pointing to a URL that appears to be a lure for pirated software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://golowaki.ru/strik?utm_term=how+to+install+pirated+steam+games PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fc94720a3f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_606241a7c6b30.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/423803.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/rukavevugijitolaluku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_6007a831a1fbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_6060fe091783b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_605c1fe5176af.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/3755a29031f3b.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/8208202.pdfIn PDF document text
    • https://tazokade.weebly.com/uploads/1/3/4/6/134698705/7198455.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_9d60c83e37fd420aacca0e8d7e8f094e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66bf05b1-aadd-42fb-af25-f219f80cc3df/22309175194.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_58b8313712ad41ffb1b6b70b9c2f175c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5254674b-db83-4a9c-aaf5-8c9923804f33/concepto_de_investigacion_cualitativa_segun_autores.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_1749cc08a01f438c953618d68c48f7c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce15dc1-50b8-4883-b7a1-94304e8b3512/igcse_physics_revision_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b856ce01-d723-4efa-8e5a-c7c9da531d06/71424267825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b88fc3-eabe-4aa1-9b94-3c4bb49c3fc2/is_an_alkaline_diet_good_for_gerd.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_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5332 bytes
SHA-256: 55d75e1c366c285815d9518f54ae2f18568b1492247849c70f09a507c13e03f0
font_01_sfnt_off0000ff3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 11032 bytes
SHA-256: 755d5ff9f5ac4b8aa2945aecad2f5e66f84cd6923d5999c9492eaa6bafea1d58