Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54930c1b898ee99…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 11:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: adb1cd5bbd0077a39e41d1f49c5ef277 SHA-1: ea49b5214184a5830546ef92637b6aee1f2c876d SHA-256: c54930c1b898ee99190025680fbb2116d6477ebc80657cebe70f25432820aef0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/wix?keyword=economics+chapter+3+review+answers PDF link annotation
    • http://vabenawak.iblogger.org/playwriting_101_glossary.pdfIn PDF document text
    • http://antonioit.space/426844864826kqic.pdfIn PDF document text
    • http://kawolamekepe.22web.org/wedavujotazogudamidexeze.pdfIn PDF document text
    • http://javoreruja.iblogger.org/recipe_template_for_publisher.pdfIn PDF document text
    • http://vetejula.mypressonline.com/71461216051.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/une_definicion_wikipedia7uhc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefipunoz.rf.gd/varicose_veins_during_pregnancy.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/pusekebu.pdfIn PDF document text
    • http://xizokokov.epizy.com/54603623634.pdfIn PDF document text
    • http://fedetikapore.epizy.com/62609124556.pdfIn PDF document text
    • http://momodew.epizy.com/6304836633.pdfIn PDF document text
    • http://ruleruz.epizy.com/yards_to_feet_conversion_worksheet.pdfIn PDF document text
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_5a896c9547584c0b8da164572f280a75.pdf?index=trueIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_31b7b31f5635413b9af4f6207abbb474.pdf?index=trueIn PDF document text
    • http://fegumipidibig.rf.gd/metabolic_syndrome_guidelines_uk.pdfIn PDF document text
    • http://didewuwu.epizy.com/shoot_em_up_full_movie_1080p.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_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 5416 bytes
SHA-256: d24a02f04f32bb4af30253c9d45e7ebbb47ccd8beb41d408a58bb6be86b4a9ed
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 11312 bytes
SHA-256: e3cfd25c7c4925f81431924c4ecb3f0faca3e0c5c1d0276d92954d99972a7a0a