Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acf1cc24252d880…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 17:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5742f43547ae77ff1a004bb0a9f0f31d SHA-1: 4a44eba91903d393dc0540c50ee82a780658336b SHA-256: 8acf1cc24252d880535b4444c4379d49834e1747a4f88a86fd5b73da51f73792
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+do+i+take+a+picture+with+my+android+phone PDF link annotation
    • http://bloemenwinkelindex.nl/images/uploads/36779648995.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/6290537860.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/gomiwizekepuratana.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/fosubobo.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/gurogesarub.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/ziwowoka.pdfIn PDF document text
    • https://ewt.cz/res/file/71210214124.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/19609202383.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109042153415837.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/sudinolejumino.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/80654530548.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/depefu.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/92947771657.pdfIn PDF document text
    • http://okvin.org/userfiles/file/nogutemakolibubiga.pdfIn PDF document text
    • http://quranday.org/userfiles/file/39249957899.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/14427858090.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/vojunabalig.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/38549945439.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jofisaku.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/84487607112.pdfIn PDF document text
    • http://jn-zhsc.com/upload/38295490638.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/53549960091.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/45092419012.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/xofuredefomuka.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/87442694527.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://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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 10948 bytes
SHA-256: b1814d07361c4a49bef51edf54ef279f8a09bbb4a3c5385283bbb7959a9ddf9b
font_01_sfnt_off0000ffd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 17620 bytes
SHA-256: 230ae71a966700e5db633d6405ad3712b785437e4f88ea9caa6bdea84327dfb0

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