Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6c8bf0b8dbacd4…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 14:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5ee41b325ad9439190955155952b0487 SHA-1: db6ab9dada37e0c0a89c20486fba6f30a48c9052 SHA-256: 1a6c8bf0b8dbacd45e772d7d8731d75d104a2503f4ca7aa9a659233b718a5dc4
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, suggesting a link farm or phishing operation. The primary URL, 'https://jottigo.ru/strik?utm_term=samsung+galaxy+a2+core+problems', is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/strik?utm_term=samsung+galaxy+a2+core+problems PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fcc9c6da0880.pdfIn PDF document text
    • https://sifurimunudop.weebly.com/uploads/1/3/4/3/134328932/34727ea4a61271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_60247b4507402.pdfIn PDF document text
    • http://turiwovezaz.iblogger.org/adelaide_crows_fixture_2020.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/bisasofigoruzo_futofib_lumomusevujo.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/kiviwew15j3v.pdfIn PDF document text
    • http://stroiline74.ru/hayward_h250_pool_heater_service_lightwncf3.pdfIn PDF document text
    • http://feroxezoralezuk.iblogger.org/proteinuria_diet.pdfIn PDF document text
    • https://kawuzuke.weebly.com/uploads/1/3/1/6/131606938/3608cb7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_f80132f4d14a4bdd92ca4b80ddb43921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e733ad-a6f4-42d3-b573-ee3be5eb192e/how_to_learn_mobile_application_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c678f5f-05d0-4e38-81a8-28bd1e404889/how_to_install_cricut_expression_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de590be7-9ff7-4f4a-8115-f68c8b1ee9cb/mindset_chapter_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2cb766-6d08-4a48-88d5-ac21c5bc6098/62244571753.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_66f27540551442229be1799d0edd9785.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1858664-c2f7-4af4-85d5-3f67511a2b64/highway_traffic_safety_administration.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_971a32c0064b45e8be3348c933cb0c7e.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_601bd2f581d148c689dd953d943218dc.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_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5800 bytes
SHA-256: afb7e56407c3513eaaa2133ffa9e9f8317fd593b4bcbc81147d8286b9ad837a5
font_01_sfnt_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 11136 bytes
SHA-256: 1d6795ae67d5c5079f405e9d08f34b2c47a3e63d7b7ac1340d308afedf7209ba