Malicious PDF — malware analysis report

Static analysis result for SHA-256 6983289c4a91f1a5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 17:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3232b8800e89a66527b0256c1385177b SHA-1: 62607ac4a5ab858e3faf3becd48380038bd53064 SHA-256: 6983289c4a91f1a51ca615cbfea3cbc6193eddb64953f4b07847409d4ff0c98d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of embedded links pointing to various domains, suggesting an attempt to direct users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=maitai+tablet+sim+card PDF link annotation
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/nobawezipegofavusekelud.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/tiwituruf.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/39881243589.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/35007590847.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/116980065061359f0bc9e02.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/tokademixokejabixupokiw.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/10089939517.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/jekevu.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/monubabarawirinizivizisu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efca5ec297---8509719144.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/nukikavuwivubamolikaw.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/sexebomudusulanikuzokam.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/totedarudodokufuxazarasap.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/47783909175.pdfIn PDF document text
    • https://777mto.org/contents/files/83344746215.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jaxurozazedegalinu.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210914032156.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/xivavafapebipemavurod.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/40625948715.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/59550861248.pdfIn PDF document text
    • https://doitoutdoorz.com/file/vBUCoInGRWzA7NCE.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tixela.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11078634778.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/tobipepazifolibif.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 10440 bytes
SHA-256: 7f7d67a230b19ac404276133e867d6e8ff5812be4610d0694c8e163607c9ee0c
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 17404 bytes
SHA-256: e86828543e00c7b1743815556779516222043c7092ae8ddd51ed9fd051ef2249