Malicious PDF — malware analysis report

Static analysis result for SHA-256 489df36509b67ca1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 07:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ee8f0a9f69bedaca5ce28bebec9e618b SHA-1: 8e36412926b6b74e36d6c904cdee9b18aa95ade8 SHA-256: 489df36509b67ca1818ac411e1699a5499e818f530ad01e30d164e7bb15bca2c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external documents, characteristic of a link farm, and is flagged by ML classifiers as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rdhaaiegcqjr09pvvtnts7fa84/36829113925.pdf In PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/wivapupavusapidifazoxok.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090315020935.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/29340626222.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/jekus.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/katinori.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/padasibop.pdfIn PDF document text
    • https://mackbeks.com/files/file/63412249867.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/kumofagid.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/risawijusu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/74819184709.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/35072200514.pdfIn PDF document text
    • https://medius.sk/userfiles/file/lotagevudanijokalurixure.pdfIn PDF document text
    • https://aedwea.com/upload/foto/najomivewar.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/deneligew.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/suvoresibefinubag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be6e369bbf---jigof.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/69215056642.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tijitisovijefazalenipokef.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/62149744110.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/75126078650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=borrar+cuentas+de+google+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10700 bytes
SHA-256: 116d3afee0efee082f3356869ef7a9295deec2a7d705ae850edd4b58992b3496
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 19392 bytes
SHA-256: 349eac40ca6887e79d4bbdcf601546e50bb64cd68e45d7782403a2f93f721015
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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