Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb92f298e4026a7…

MALICIOUS

PDF

76.9 KB Created: 2021-05-24 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 232a608c5a5dfaa1b20d5cce872bb3c5 SHA-1: f2601d036ac72e7c3ac0cb0e57d9808e9f636d3e SHA-256: 1fb92f298e4026a7eea97a7e2ab47fa3dbd41c1b1fbbd13f5693ae9863cb4486
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. One of these links, 'https://maypoin.ru/strik?utm_term=semiotica+para+principiantes+paul+cobley+resumen', is directly embedded and likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=semiotica+para+principiantes+paul+cobley+resumen PDF link annotation
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/pariwexumalimom.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/8e99bba147db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_602e22286e7e3.pdfIn PDF document text
    • https://faxosuxen.weebly.com/uploads/1/3/4/3/134342902/patavo-zorenelu-wixoketutip-penetifijakajod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455377/normal_5fdd2726735b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_601ec91ef3e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414682/normal_5fc6840fdb1d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5fddd686279b5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/cotton_eyed_joe_viola_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/ultra_balloon_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/67525248485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d753a209-6df6-4db6-b629-1a02e4eb3aca/how_do_you_fix_no_dial_tone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b67db114-7185-431d-b2c2-d4c5b27677ca/tusivupijajamine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0639d5-f744-4953-aa26-95aad6059b2e/computer_hardware_engineer_jobs_in_chennai.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/wotetoxobaxiwigos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67890878-f3e1-4a37-945d-0ad8a8d35194/dork_diaries_14_google_books.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/analyst_report_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c852e3f3-461c-4e21-8b67-daefeea10114/vubadefezufuxasivuva.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/87413999287.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/sudanuzubizega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05696f35-853f-45f9-af91-58455bbfe4e4/38177455786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31070e6-4dcd-46e4-8308-2e6eaf5e0eef/12022027021.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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 5424 bytes
SHA-256: f60cf29db4d0e4b16b4959583d6d52f2108d4ede20729c7c5e0abf111107f5df
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 11416 bytes
SHA-256: 061cf383e47b588968be8c83d5fd4412b79d8537d2d8d49ec1699c43cd6f5397

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