Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d9347896365b14…

MALICIOUS

PDF

97.2 KB Created: 2021-09-17 19:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1a29c0e3d63088b6cf9dd31eb67f9de2 SHA-1: eda5a7c3f224ae47c500a9c29bb375736988a7c0 SHA-256: 94d9347896365b140557f4a5b82cd0bd1d838b893859e9abfbc75a82beeeeca5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=attack+on+titan+season+1+episode+1 PDF link annotation
    • http://assytekservizi.com/userfiles/files/tejarubivawan.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/zepamogijujadumivorosa.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/1923553646.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/83933069845.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/xakeduxedenumogukenage.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/gurupomegabarilejov.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/76363469447.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/gisatoxo.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/depovufibobazuresuxizemav.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/68187621949.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/90578780158.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/57917828035.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/levisukukijovutazutonolo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/wazobizimakakugisuraguf.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/13866274536.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/dukasijekulekip.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/74538610258.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/36524001055.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/97888613395.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da78b9d6bf---74969583556.pdfIn PDF document text
    • http://na3.it/misc/file/sesuwafa.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/sofatesosabobefinovak.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/44198316940.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_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 10484 bytes
SHA-256: 8eb4773ff32adf1f785dcce465424433db080aa7c219b34a75c6001c98433ee9
font_02_sfnt_off00013c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C54 22568 bytes
SHA-256: 536c69d73e5e3215cdc1db3b63cae32ab1bc2d546a6285f6ccbbca32493ee9f0

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