Malicious PDF — malware analysis report

Static analysis result for SHA-256 72be40e76b51c3b5…

MALICIOUS

PDF

72.3 KB Created: 2021-02-11 23:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 480ab4837febe7893036d05149908243 SHA-1: b8970749292082b68604e61e0fddc2e221708666 SHA-256: 72be40e76b51c3b5948dfb306713b3e037ac0e3d2dd29c14b435d9d9bf795971
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/123?utm_term=tipos+de+procesadores+de+textos+y+sus+funciones PDF link annotation
    • http://berezarivire.iblogger.org/civil_engineering_project_reports_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451045/normal_5fdc86dee3bd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376105/normal_5fdec4ad68c6c.pdfIn PDF document text
    • http://detarekowopowub.22web.org/colored_corrugated_paper_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477376/normal_5fc64b399765a.pdfIn PDF document text
    • http://bella24.xyz/33957971274wpp7c.pdfIn PDF document text
    • http://xovekofetovo.66ghz.com/coliform_in_urine_nhs.pdfIn PDF document text
    • http://tigatixe.iblogger.org/mafabokutepuxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457848/normal_5ff613c4b94e1.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/8973428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5fd89e51a54c2.pdfIn PDF document text
    • http://front-glass.website/gerugaguwuwoxen4ofys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lekekavom.epizy.com/best_app_for_ipad_pro_pencil.pdfIn PDF document text
    • http://deravamosu.rf.gd/cordova_android_assets_path.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 5120 bytes
SHA-256: d79979c0a7617de3009ab960ba38228240bf1b5703036bda50aadf4470fd1ce9
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 11356 bytes
SHA-256: 05a246051592d7f5128d8a3c2bb014732daaa1ad2aa1c3541b7b25f8261cd7a0
font_02_sfnt_off0001043a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333