Malicious PDF — malware analysis report

Static analysis result for SHA-256 c566df1874fd108a…

MALICIOUS

PDF

69.0 KB Created: 2021-02-21 10:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fad1ccc85f10cbf70ed8762f408bb533 SHA-1: 33df41132f76e948fc87658f45c3ef4097c0aa44 SHA-256: c566df1874fd108af08d67937dacb96f0bcf3612d62d53a9b15387ad9cc495e3
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to ISO 27001 standards, suggesting a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wb?keyword=iso%2027001%20standards%20for%20data%20center PDF link annotation
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/8971098.pdfIn PDF document text
    • http://oyuncuxx.com/36016644372gi36v.pdfIn PDF document text
    • http://notdull-eng.online/pumujz5c14.pdfIn PDF document text
    • http://tugrull.com/govijotopigovozasiglutu.pdfIn PDF document text
    • http://yildirimotobursa.com/gabriel_kuhn_and_daniel_petryp6w6e.pdfIn PDF document text
    • http://kuzojud.66ghz.com/28010733170.pdfIn PDF document text
    • http://frut-tree.site/xifubemesufovokizase48bhh.pdfIn PDF document text
    • http://zhigina.ru/anthropology_books_freen9nnx.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/jipowumat/80781306548.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/challenging_symmetry_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/clean_and_clear_oil_absorbing_sheets_walgreens.pdfIn PDF document text
    • http://fetavuxoze.epizy.com/gajukakivemuzok.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/pregnancy_risk_assessment_template_childcare.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 5328 bytes
SHA-256: e51553809f0c7d89cf8b89e8b8a0323f1021d5dffac83655ee78994a233f6acb
font_01_sfnt_off0000e1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10864 bytes
SHA-256: 224fd98f6bc93abbb4f5c6b819bfb47956d5efc925fcf4bee2cea5a8646ddbc3

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