Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc19b35de9f29cb9…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 15:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca4035427f76508cee1aa97b0fc7da97 SHA-1: 482319bdc1a00f8b6d0487c9d0ba30072bad10f8 SHA-256: fc19b35de9f29cb96c40746f3381b91ba325c4180b0c92af1ddfd1598fe1ffb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=tribal+braids+with+beads PDF link annotation
    • http://yoshitomo-kokubunji.com/jcfiles/file/musifibutikuwiwasovopara.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/povatosaguxetotafofarum.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/25628462129.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/75089138737.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/16689234633.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/54243413406.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/keravulad.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/51647150679.pdfIn PDF document text
    • http://qfuse.it/images/uploaded_files/ckfinder/files/1631432250_7bd353a758.pdfIn PDF document text
    • http://modern-pro.ru/files/file/1609322742.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/rerolilonivokogi.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/90138235109.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gufave.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/58128166961.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139ffe12dadf---61309465050.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/40914956773.pdfIn PDF document text
    • http://artediapharma.com/upload/files/72270062613.pdfIn PDF document text
    • https://krusomying.com/data/file/paresunokelu.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/jatij.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/sutamilel.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/60736505736.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/45353436723.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/62674920072.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_off0000b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB189 10312 bytes
SHA-256: 30b491fef4af4110ddd35accddb7f450a5444820ee5e9e974b2374bc23074060
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 16056 bytes
SHA-256: d17db7a1831486e494eddc3092441626351f51ae203d70366fd0e9c18e03519f
font_02_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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