Malicious PDF — malware analysis report

Static analysis result for SHA-256 634d8ed31dcb9ac2…

MALICIOUS

PDF

102.6 KB Created: 2021-03-31 02:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f8cc23625b94611e264c1e5a7ab863ee SHA-1: 11a48b259cd76a7ffa958c4ae4bea281abb1f02e SHA-256: 634d8ed31dcb9ac2c946a991858bfe8345a9fbc74dc29e3a6e20ae9c6325eb19
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 0.9994

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://vilenefex.ru/award?keyword=edouard+manet+biography+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5ff9b8a55a729.pdfIn PDF document text
    • http://zibenavepasapep.iblogger.org/garunego.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/kejusijogoxirodidewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_602384a34510f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383800/normal_5fc6dba1e292f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_600e0ab8193cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476593/normal_5feb014ab7ba7.pdfIn PDF document text
    • https://kawikixefi.weebly.com/uploads/1/3/5/3/135388441/mimas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_603f09e9be6eb.pdfIn PDF document text
    • https://bijimeko.weebly.com/uploads/1/3/4/3/134327756/eb28c0aedfd4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402712/normal_60243a8b900d9.pdfIn PDF document text
    • https://fakivafepupu.weebly.com/uploads/1/3/0/8/130873921/bd0277553a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_604132320a8fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofenilar.epizy.com/football_training_program_for_youth.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_6fe62eeec8ed4b528aa0f21437d708c6.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_f8cb3000ba104e0aa4673bd30e61c121.pdf?index=trueIn PDF document text
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_4fe63e5c460c4711a03be499ada8dd09.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_7b3652a8c10a4720ae1de632b482346f.pdf?index=trueIn PDF document text
    • http://xupasafagimi.rf.gd/agile_project_management_templates_excel.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_24dd096a9655481ba6457289c4776538.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_e29d26f35505454e846cef7212bef6d1.pdf?index=trueIn PDF document text
    • http://fobeguwimot.rf.gd/52528644849.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_off00014ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFB 5444 bytes
SHA-256: 4395120fef6023789ff5a158acebbc8eeb619d35b026704d43dab1aa6849b871
font_01_sfnt_off00016261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 13536 bytes
SHA-256: 8f66574c5736c7159277cf3a8ffb088283b0d951737715c858e713ec0ba0af36