Malicious PDF — malware analysis report

Static analysis result for SHA-256 e094e77bd97b39f6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 00:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b42da0193798f80d75a7ebd0386da213 SHA-1: c3469ad6d2073a39938eb50399a3e58f6c8ed9a5 SHA-256: e094e77bd97b39f66933e8ac40a9d23953d8b9460059d73f0520ca1e0d7225f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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://crysiq.ru/uplcv?utm_term=sistem+android+webview PDF link annotation
    • https://actsonics.com/uploads/files/202109041210204159.pdfIn PDF document text
    • http://meta-min.com/files/gerezewe.pdfIn PDF document text
    • http://njxinbell.com/upload/files/fevixutudovofep.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/34964206618.pdfIn PDF document text
    • http://www.pvvc.cz/files/26400360805.pdfIn PDF document text
    • http://www.bash.cl/media/file/65968844741.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tegumeworudipib.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vupelizixibaf.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lepasikofanakufixivomegol.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/93650143937.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/domofezaso.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/zulamijazexo.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/8714852246.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/38818311371.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/luwop.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/nifogajixesivowipixejofo.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/88409128752.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/titima.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/33437474566.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/bejuf.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2063775533.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/supalimoxitipivizosapo.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/zanofesam.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_off0000c090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC090 20568 bytes
SHA-256: 4bca65892871175288eb1693a746c75d2ad59af55bbc36f7de5460925349d96b
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 10732 bytes
SHA-256: b8e607b63a90466664e65ae4faaa8741c695c352b2f00ec9a9850a6df3564cec

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