Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed9bcd8c25e0ebd…

MALICIOUS

PDF

73.4 KB Created: 2021-03-17 09:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 81394086b1b6d310d29d00d2c444f3e3 SHA-1: 27c4827df3cfd76d594888aa078b7f346595d1c4 SHA-256: bed9bcd8c25e0ebd3d1ae985df827c2fc9193042e036f1e5c647804ac492656d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://maypoin.ru/strik?utm_term=can+you+get+a+bachelor%2527s+degree+in+psychology+online', is presented as a deceptive lure related to online degrees. While no scripts were explicitly extracted, the PDF structure and the ML classifier's high confidence score indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=can+you+get+a+bachelor%2527s+degree+in+psychology+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369796/normal_6025823c83a9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_60413f6caadbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475586/normal_5ff7e1544cddf.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/tivinew_sirinogudo_kumoke_xokusivag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369932/normal_6004f54b5f7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_600beea0b230b.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/kugegilogid-dobavamikewo-jepebofel.pdfIn PDF document text
    • http://bofasojeg.iblogger.org/21914754919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_6018d9ede5812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_6028a4d92e91b.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/dogazisuze/50663388763.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_4ca6d398f445409f848a750fc714e7d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/arteriovenous_malformation_grading_system.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_6d66eff2162d44f3a1a92a222edfcf1b.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_9f7524b35d06494e9372107f5f1afaa8.pdf?index=trueIn PDF document text
    • http://zaxutakizet.epizy.com/icomania_level_15_answers.pdfIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_2ef2087dd0f74195b513f56d251e4cbb.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_f8d465c38f0545d7a5a839defa944857.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 5516 bytes
SHA-256: 5b20ada86347c3bfbe336f9fa0388b50f397da266dc75bf57eb1da804e92db87
font_01_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 10412 bytes
SHA-256: 76aa2d366458a18e120ff42c0b97e7276e7e8ba1b1ada1813c4b484e5d2d41d7