Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c5000e665dd397…

MALICIOUS

PDF

78.6 KB Created: 2021-10-08 15:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3bcda07a5d2a1799307b5224bcc0e957 SHA-1: 867164b6d573b23666466b8f0da1ccb37f2e0b24 SHA-256: b0c5000e665dd397853a31a97e1c471dc1c241f43d5a45af0094e267f0d32da4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host many links, likely for malicious purposes such as phishing or distributing further malware. No scripts were extracted, but the document structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=words+that+start+with+a+and+end+with+c PDF link annotation
    • https://cissud.com/uploads/ck_editor/files/168450139.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/39a3cb3b7f8361604d1b2f5edd98ea4d/nugumedudogujixexuborugi.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/11928335648.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/soxuranixaw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/22185794193.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/zojixe.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/99815111596.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/45683803990.pdfIn PDF document text
    • http://www.bash.cl/media/file/woporutinov.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/dokoforemum.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xumuleditojazero.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/876382574.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/temorumutezuxinifobulo.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/nirafixowejaxamupeva.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/42089991249.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/lopesibekopupebodolaze.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/bomobivifabexuxibomemew.pdfIn PDF document text
    • http://palami.by/images/file/75104871165.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/44117657541.pdfIn PDF document text
    • http://a899.net/userfiles/file/3457909065.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/89931324897.pdfIn PDF document text
    • http://josquin-capella.de/download/bubofosexodoze.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/zetarixozuvi.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/72494108590.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_off0000cb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB97 18904 bytes
SHA-256: 917124a2a6648e631a7e2e43f36984c4c6d2f937661a6bffc1b73b63400e18d3
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 10500 bytes
SHA-256: baa4b90f29db04d3d438b2a4b2684ebb9069e756acdc3ded5dc69b89093a405b

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