Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca0a5957f63a1af…

MALICIOUS

PDF

84.4 KB Created: 2021-09-12 14:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7ec10f27991b0c3d769532ca1b29901 SHA-1: fb5b798638bc98a323220bb90f8a54f36812b61b SHA-256: fca0a5957f63a1af78aea6f33110341bed1abdaa11c26864a65066ecf30f7686
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a link farm or redirects users to potentially malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://catamma.ru/uplcv?utm_term=adb+get+app+list PDF link annotation
    • http://sbriz.ru/userfiles/file/25435280559.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/fifebefivujise.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lenul.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/24211394691.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613630f1642f9---8196302269.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/43689381570.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/20199834322.pdfIn PDF document text
    • http://land89.com/ckupload/files/begukixilusepo.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/janaxe.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/tuzipazub.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/79042427823.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395d54a5c91---86540831465.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46353279664.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/11733188234.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/bupekipi.pdfIn PDF document text
    • http://cityfate.com/files/files/metiloxugoni.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/bofivigazonokase.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/fupaxunuxel.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/setoxunekegalu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/49772956304.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_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 17068 bytes
SHA-256: c00b766bcadd3df8bca41b7083555694b642917b91f1e2e4bda58e84defd171e
font_01_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3C 10364 bytes
SHA-256: 87d2d9d422331aab0a5d84171bade7f3bb582b1cb76b9a8bb3a5149c041859a5

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