Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726a950322fac2c…

MALICIOUS

PDF

81.1 KB Created: 2021-10-08 00:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1aaaac93802359993c9ab598c04384fe SHA-1: d32952924da4d0e0f57af764d697150287ad5b1f SHA-256: 5726a950322fac2c966a126bd5a77ba767482d41c561e783b78c84c6f31d1df0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards an attempt to lure users to malicious sites, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=free+battle+royale+games+android PDF link annotation
    • https://olboihorgaszto.hu/editor_up2/54996606193.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/11345561332.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/5452260601.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/vigaxufozumipuperurovi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/51568242310.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/potutupulo.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/52830905830.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/4177635798.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/72894060075.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/25302775611.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/97974457167.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109090553168109.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/xivajowupege.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/fubopukoramerib.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/22684457904.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615a511cdc248---guxuwaw.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tejobif.pdfIn PDF document text
    • http://ahppesticide.com/userfiles/file/93207245246.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/gutelelubelumokeni.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/lotafafovukakirep.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/467684409.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/dowulubosupurej.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/pofososojedare.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8583206fc464bdfe62d75d7350861af5/59045984332.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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 17940 bytes
SHA-256: 3dd0c37a868d9598b64f2be35e88469906f0b188b68424151874ff48b5f1b7e1
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10820 bytes
SHA-256: 24dfbccd8a1322a3e7315244c0fb8f2855f98c6167a2d9a3e5fd4ef1b41a2d5e