Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb041dfed25d745f…

MALICIOUS

PDF

82.3 KB Created: 2021-03-28 12:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b77899004b9a3a35f4f6ddd976169d74 SHA-1: 12d551b76b291c3dd93e125ddd04c4b912d5c309 SHA-256: fb041dfed25d745f000df70cec5f0724ebd2358ffa2447564523afdc1ef8ddb7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bologen.ru/123?utm_term=attic+greek+grammar+pdf PDF link annotation
    • http://giwapozolaleg.mypressonline.com/55946095885.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/bt88rgf/xexonitimidexanogefoxur.pdfIn PDF document text
    • https://gapakoxolu.weebly.com/uploads/1/3/4/7/134745497/ruvufuwalarepetewuji.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/heGLRuv/samsung_smart_tv_split_screen_problem.pdfIn PDF document text
    • https://dufofisejufosu.weebly.com/uploads/1/3/4/8/134875198/cf958c0.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/gumerog.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/jhsv3gf/union_jack_flag_bunting_template_to_colour.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/biguvumixulaposuvu.pdfIn PDF document text
    • http://rixujewo.getenjoyment.net/pajawu.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/6572415.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/tiigeRv/96835019067.pdfIn PDF document text
    • https://lafefozusut.weebly.com/uploads/1/3/4/5/134597047/ecab1.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/053b04ab38db3.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/motexavexavawi_vuwapamukivun.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/39056302735.pdfIn PDF document text
    • https://mitabepomumo.weebly.com/uploads/1/3/1/8/131872015/8793753.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/tihJi4r/51315890797.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/mimaxifaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_8818391791004096b9fb8f83e890cd67.pdf?index=trueIn PDF document text
    • https://2c549fd3-bbcc-4e43-aea5-84609313cfd4.filesusr.com/ugd/c162b3_93ae47047bab470282bfb7b39bf53308.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_9a3d30717ef34c9493cf98b42dc89342.pdf?index=trueIn PDF document text
    • https://8e75e8be-0f37-480b-85ac-641553c1acf9.filesusr.com/ugd/a4a1ce_1875f9d064604e93880bb954fd44b7b6.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_d3f1155fef374769a8effd5a09651096.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_b2c17f1d397c4954839027b150180d74.pdf?index=trueIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_0d8700f6f4d24c59a2d9794cbd63b17e.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_28609e78890f4dd6938f6dd5d4d8b03d.pdf?index=trueIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_137b9aabbe104b1f96ad0ffba571b096.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_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 5316 bytes
SHA-256: 106fd3dd785d4bc3f11f0d09a30ab24ee8d90a182ec91bcab0b6decf3ce847fa
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 15212 bytes
SHA-256: 8bc8a0924cd657e0f67f354e588ec1cfeb733ef2b077e74c5e22216ee832df3a

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