Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66dc5ade2b9ed25…

MALICIOUS

PDF

88.8 KB Created: 2021-05-12 17:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 56c6a2f814439098678f347f3b4222ca SHA-1: dd970dae5b208c179f368dff57d96055e1bd63b8 SHA-256: b66dc5ade2b9ed254cef55d7eed0778c671d8ca3ace9f2611d87d280da709ff5
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as 'https://bologen.ru/strik?utm_term=does+oregon+have+a+real+id+driver%2527s+license', are likely used to redirect users to malicious sites or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bologen.ru/strik?utm_term=does+oregon+have+a+real+id+driver%2527s+license PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488604/normal_6036f468acc43.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/22524845175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_6060503c3c348.pdfIn PDF document text
    • http://sugalomiwuto.getenjoyment.net/msds_for_caustic_soda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_606a659b996d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463830/normal_5ff7a2545aec7.pdfIn PDF document text
    • http://gunurovidoz.iblogger.org/72476635456.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/class_10_civics_chapter_7_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_606e50db1ee75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_602f5da61a936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_5fe3d9896ff7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_6002c5f294aff.pdfIn PDF document text
    • http://jogedisilokazex.iblogger.org/56944743048.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467571/normal_5ff6d29f1fbf0.pdfIn PDF document text
    • http://sovolox.getenjoyment.net/classroom_instruction_that_works.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_603a4499430db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_4dda04e0a66340788176e225a3ac91de.pdf?index=trueIn PDF document text
    • http://gixunov.rf.gd/93251768176.pdfIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_6a700250eb0d4e51abf638974da4a3b1.pdf?index=trueIn PDF document text
    • http://xiwewalatefefus.epizy.com/62870025133.pdfIn PDF document text
    • http://falariwupap.myartsonline.com/hospital_and_clinical_pharmacy_textbook.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_50af03dd05fd487a8d92f97f1412c96e.pdf?index=trueIn PDF document text
    • http://gepuxaxevo.rf.gd/animations_app_for_android.pdfIn PDF document text
    • http://didefiwofiko.rf.gd/blood_group_test_report_format.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_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 5296 bytes
SHA-256: 7f7838aba9fd0c3ff7a98fc430fb62c657a9ebad471160fc5cd7a07edc85cbe5
font_01_sfnt_off00012ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC2 12376 bytes
SHA-256: 44a6f5d384b1970ef7bff97f44d73592fd23ce571d20f1602e3a8bd9cfa7fce5