Malicious PDF — malware analysis report

Static analysis result for SHA-256 3768d89ab346ca86…

MALICIOUS

PDF

85.1 KB Created: 2021-06-05 10:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 987fff3e9373d1d005e42a03a8baf647 SHA-1: b40a836924f897178122ea4dfa3f426fc0527012 SHA-256: 3768d89ab346ca86c6757a97a951f0799cadd18a5c01e1be42ea3fd45e39b53b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/123?utm_term=softwares+s+sites+free PDF link annotation
    • https://bunogijadijis.weebly.com/uploads/1/3/4/8/134896562/setexezaja.pdfIn PDF document text
    • https://fowedejuman.weebly.com/uploads/1/3/4/5/134518602/tixudurejodimer_jedaxojog_wonezozikusa_wovas.pdfIn PDF document text
    • https://diforugagok.weebly.com/uploads/1/3/2/7/132741100/razewevifejogifufeb.pdfIn PDF document text
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/d0e455ebffedc43.pdfIn PDF document text
    • https://zorutamazu.weebly.com/uploads/1/3/4/0/134096431/polilutugitu-guwobawimen.pdfIn PDF document text
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/gowijukekigekawirapo.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/difovurakoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144570384/kepasivoduxejijaneke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eaefa9b-50eb-44c6-abb7-072ec2c4ce72/relivoxemivuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3fe860-f2c1-4ddb-9107-69a5977461aa/20172242903.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/liriketinegajolurexoduta.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/w/file/fetch/144652329/homeros_ilyada_ve_odysseia_zet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32ea16f-b316-4722-8112-208f37988aa3/oracle_sql_interview_questions_for_3_years_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46339f61-0f91-421d-a884-c35b70dcc5d1/dbt_tips_and_tricks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3164c0cf-aa47-43b1-8a51-e6e9ab94e862/el_paso_sheriff_department_arrest_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcaebbd8-94db-45b0-a5c5-a2edba5b68c5/cada_que_te_veo_palpito_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9804e116-eef3-4df6-a935-f138ac423636/human_skeletal_system_worksheet.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144562002/78403658356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c18b10-32c4-4dd8-9b7c-d2040da81018/black_diamond_headlamp_flashing_red_light.pdfIn PDF document text
    • http://papoxuva.pbworks.com/w/file/fetch/144421440/tewanefiremizibapimipa.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144656643/vopane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a24979-4e53-4541-9d60-dba53dada792/zakuxew.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/46055397953.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_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 4924 bytes
SHA-256: 3916f175bbd9c4ccd0c7a0e1d3a5ffff118357fb73169e6f636fb6cd8b3ed6c1
font_01_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 11136 bytes
SHA-256: bbaeb869fd1b4bfb9596b8f6846886d531fd93e1b0de77680855645754629794