Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff51377c35154ae…

MALICIOUS

PDF

87.2 KB Created: 2021-06-12 05:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de924d87747d92715fc6cfc9696ff3f5 SHA-1: 26a1e47e540e5d02306305be515f8bf5db6e2c71 SHA-256: 3ff51377c35154aec4c981ee89dcdf2f40e5b64942f12c04314d4520b9ca75df
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 pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The primary URL, 'https://ketchas.ru/pbw?utm_term=avengers+age+of+ultron+tamil+dubbed+full+movie+download', indicates a lure related to pirated movie downloads. While no scripts were directly extracted, the PDF structure and numerous external links strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=avengers+age+of+ultron+tamil+dubbed+full+movie+download PDF link annotation
    • https://seperabe.weebly.com/uploads/1/3/4/7/134714478/polevibezu-bodesotopejeda.pdfIn PDF document text
    • https://zumaraje.weebly.com/uploads/1/3/0/7/130776401/7741947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416131/normal_5ffb5ab423f6d.pdfIn PDF document text
    • https://naxibanumudu.weebly.com/uploads/1/3/7/5/137516291/juferetan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6054e5af59d3d.pdfIn PDF document text
    • https://nufulukoveta.weebly.com/uploads/1/3/4/7/134700555/fexizusirediz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_5ff9f55059bd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_6056e547b8d97.pdfIn PDF document text
    • https://xafixefar.weebly.com/uploads/1/3/4/7/134714422/detexatamas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144669972/joxaborofokalonesesupenir.pdfIn PDF document text
    • http://febigadeviti.pbworks.com/w/file/fetch/145116459/always_and_forever_mariah_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e27edc-a8c2-44c5-b972-1ba0b755649d/jufinegoribatapi.pdfIn PDF document text
    • http://metudebebi.pbworks.com/f/61944732692.pdfIn PDF document text
    • http://ravowibosu.pbworks.com/f/fodulosuvukam.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/f/metajafugojemotomipoxeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac34e24-116e-43ab-ae42-3732b68d8301/contrato_de_arrendamiento_minerva_para_diligenciar.pdfIn PDF document text
    • http://felinemumivu.pbworks.com/f/tawojorejisujelipawugar.pdfIn PDF document text
    • http://duwaxifu.pbworks.com/f/total_drama_island_oc_fanfiction__50____Low__0.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/tegoviresorovizidebavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5674fc05-e400-465b-bb1f-20eebfa0f4c3/tovurifigexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1624d050-1795-460f-b962-b8950973713b/what_are_the_three_core_principles_of_cell_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448e8d47-f998-44fd-a274-08ab3d2bdd00/journey_to_the_center_of_the_earth_1959_dinosaurs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39f5871-0518-4673-ae0a-9b342af86d81/52010034465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26309cb6-6ba3-4f2d-b233-3b4d004a289b/40394702811.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 5508 bytes
SHA-256: 8f6569f65c97e56c23b5f1e6ececacc9361f930679e704a212608830696282f3
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 10676 bytes
SHA-256: 760b69c44186fc48d81faad4f6b8d164f86ecc59d6536820d24ac9f7f68c0b76
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 11632 bytes
SHA-256: 169293ba556ff4a03f03819b3b9a90119afc0c47baf7c23f8f47ee8665be0750