Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddabc8b2feba1eb…

MALICIOUS

PDF

76.5 KB Created: 2021-05-19 23:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c0987cc1b5c4f2b4e8e2d70dc4916452 SHA-1: 7556b9795703306dccb4214b1dfff9047286aef9 SHA-256: bddabc8b2feba1eb06e9549260217e85100ab73a6c846fa2da52599ed536fac6
186 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, containing numerous external links to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO manipulation. While no scripts were extracted, the presence of many external links suggests it may be used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/wb?keyword=optiplex%20780%20ram%20capacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6058bc90da3c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_60102c048433f.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/zerarafinujukuz.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/neludedegelodok_kuvawikovaj.pdfIn PDF document text
    • https://poxovarakegi.weebly.com/uploads/1/3/5/3/135326731/0683ef7bb0258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6059071500ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_606a590c0d0fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5fe8ff2f812ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421036/normal_6006db1d554be.pdfIn PDF document text
    • https://tokafiwunan.weebly.com/uploads/1/3/4/3/134372509/3714676.pdfIn PDF document text
    • https://wazafalesozem.weebly.com/uploads/1/3/4/4/134498636/1712050.pdfIn PDF document text
    • https://betamomaj.weebly.com/uploads/1/3/2/6/132695924/pupigifop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_6001918c93cae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_60053e45cfcee.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/fawegof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4d5b70-024e-43e9-9fd7-bedbf7cbb96c/the_entertainer_sheet_music_beginner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7e6851-781c-4acf-9773-51a6fe6d449f/anne_rice_beauty_and_the_beast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b97823-a49a-405d-8692-4e8b5ac21f51/does_honda_make_pressure_washers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332f3e9b-e17d-4e68-b561-83039748d43f/fobuwajejuzazikavun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81655f99-1542-4cf5-aaf5-9d9d47264d6f/21749931848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac0aa830-cd8f-43e2-ae45-a04989a4f947/26800531985.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 5512 bytes
SHA-256: 22bdea489c8f0dbbbacecaef3afbd2fd5e8ecdd3028d84d8d4901e102ea511bc
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 11384 bytes
SHA-256: 829f5ba467db9913869c7fba47e3520e111a37f6228c67ad62f30f4773209c1d