Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b90387489b4b522…

MALICIOUS

PDF

74.3 KB Created: 2021-10-03 16:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4df7dc63461df52ab09665bce1253996 SHA-1: 8f955e4128bce05dcc3d41f2c535724730b283f8 SHA-256: 9b90387489b4b522545c28192c3cd43b8793496e458d7ad42adcff9337f6b2d1
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, many hosted on potentially disposable domains. The primary purpose appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://benmoonpharma.com/userfiles/file/rilijurolef.pdf In PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/60668554394.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/40385779477.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/kabevurero.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e28631d2fc---73848030964.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/jasazaxemeboxetizizizo.pdfIn PDF document text
    • https://oferta.lt/i/File/febugamedenugepukiwiwa.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dofanawad.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0f9f1f9c---fozotanazigen.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/novamigemipisuze.pdfIn PDF document text
    • http://tochalco.com/uploads/files/lelukuna.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/39584563217.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/64172867115.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/70703019965.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/36920245667.pdfIn PDF document text
    • http://sunway.me/uploads/file/100020242149.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/22280960466.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/guxija.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/14090653355.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/73891254732.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/79329081788.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/33212480436.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/wosazudezoguruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=whistler+xtr+558+reviewPDF 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_off0000bcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFD 18284 bytes
SHA-256: b83a35bdf62aa894a561ea3123a07509fb66c6e39189d2f1263a6d2c4a3156d3
font_01_sfnt_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 10408 bytes
SHA-256: 6ca6bfd64d0fb95effb2d1eae9cb6eb14842b1e63db96eec801489882515d354

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