Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cceb673919f65d…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 18:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1bcb047a4a401c991f2c995bc1c4cc28 SHA-1: 6ec0170f0fa348ebbc2fbb14b29b7840b147e2ac SHA-256: f3cceb673919f65d3959fdc63648988027fa5a2e8926c8173fc23cb9be5db850
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially disposable hosting, suggests a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/v35s9hsadsm9a0nmd8lpmsifc5/36546812522.pdf In PDF document text
    • http://teenmag.cz/userfiles/file/57760223453.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210906084757100.pdfIn PDF document text
    • http://lola168.com/uploadfiles/file/16019905810.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/93641995387.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/21363890319.pdfIn PDF document text
    • https://labelmarket.pl/data/file/gosigawuburalavosuralum.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0bu5ru42rgalagc9ql65v4kqm8/difin.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/99222982725.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/woxatikilavojapesadodel.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/rirakorosopakutiwiw.pdfIn PDF document text
    • http://generaldistco.com/images/file/dodamuzolexiziwawuv.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_536BE3CC1FA52EAB.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/nokafanafogawesasasuwu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/xositixobepuxezikuf.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/86061204393.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/nolutafijavifasozawu.pdfIn PDF document text
    • http://standardamulet.com/files/files/firuwejegap.pdfIn PDF document text
    • http://tradingcall.in/ckfinder/userfiles/files/92144698317.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/84246054580.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/xaxinidemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=share+folder+from+android+to+pcPDF link annotation
    • 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_off0000ab9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB9A 15092 bytes
SHA-256: c5d3a15338ff7d952e6110fa901844096a7d634ad8ee3d965f9e7c25ae4bfe26
font_01_sfnt_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 10792 bytes
SHA-256: 2c42b748db31ba4b4bc730bc0c61b85b2eba37295b007570bcbfce26044caf78

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