Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5023ff16ea32d7…

MALICIOUS

PDF

80.2 KB Created: 2021-06-04 14:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9a880f2c534a03f3da5e721afd4a43a5 SHA-1: cfa99282d3592e1d6047e1c425279570f8372215 SHA-256: ff5023ff16ea32d72f8abfea306b59d1b4e02a75d73a99481b8fb79b641bde7f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crophysi.ru/123?utm_term=oss+bss+in+telecom+pdf PDF link annotation
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/fumupeti-wakoxev-katuga-gopiz.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/53a982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_5fe65f168a6d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5fd79133a2204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5fd82ae27f9f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_6003c1655d68e.pdfIn PDF document text
    • https://fesogewil.weebly.com/uploads/1/3/6/0/136097302/wopajajojuditawok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_602ed139a53b7.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/2722120.pdfIn PDF document text
    • https://xogepavawoda.weebly.com/uploads/1/3/0/7/130740110/2aea1173a75a7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_603f06a6dfc56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_60628a2d9ca89.pdfIn PDF document text
    • https://jewepixixa.weebly.com/uploads/1/3/0/8/130814248/lukukodenevabuxe.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/movif_pokorugu.pdfIn PDF document text
    • https://zenerabu.weebly.com/uploads/1/3/4/8/134870876/3033400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gabumur.pbworks.com/f/weponotasijuregemijugun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e001132f-c0f6-419a-9ceb-119a21750f04/alla_prima_impasto_definition.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/f/french_worksheets_for_class_7_cbse_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e69f3a-a37b-4d57-8a44-d25b40aec13e/how_to_use_shark_vac_then_steam.pdfIn PDF document text
    • http://mujusevo.pbworks.com/f/lujaku.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/86828867181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82302580-d04a-4207-9c8d-3520023b9e5d/zexazotimiloduwevorekila.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/cold_war_activities_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515a80d4-cb84-47c4-9b72-93a0f80fb5ec/que_quiere_decir_titulo_azul_sellado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bb87ff-ca60-4933-b38a-ed015e4634bb/dexoza.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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 5164 bytes
SHA-256: 4290ed6c546b43bea496df18b11c4f21e6485d0359a4be230ef2f19061b48486
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 15100 bytes
SHA-256: 306786a5cf09f4e1439a574f1465d557585dd8d1b4d5dc1223d93fa0e74e759e