Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c308a5543531a27…

MALICIOUS

PDF

68.6 KB Created: 2021-09-22 17:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb17f27ebb2cabe5e35f1c011bace4f5 SHA-1: c3790ebaf56a4e219662f3242afcb2d0e7eab09a SHA-256: 5c308a5543531a2774425771d053a918e0d0a40accf79c27f0dbabf39d44207a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for a large number of links, which is commonly associated with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marblo.ph/app/webroot/img/files/67647084106.pdf In PDF document text
    • https://pt2-turbo-j3t.com/contents/files/53082675135.pdfIn PDF document text
    • https://matricula.arendic.cl/files/17774532891.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/bitewalemefisivodofisud.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/67194869498.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137604e8331b---42889992558.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/nidujiruzez.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/ledomevifaz.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/51401427171.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210901_EF4103F05B309471.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/luxovenedugerezugawad.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/4245659568.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/13628919258.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/75048902985.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/79046311585.pdfIn PDF document text
    • http://trieuduong.com/images/Download/gekuxiditekalukilejet.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/mesijasakadagufapumiken.pdfIn PDF document text
    • http://tabletopad.com/images/file/32499108617.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/nuzavuwatisi.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/gasaviv.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/37348870846.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/9058919025.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/14565426820.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/sakejafepalogagewizade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=apk+editor+latest+version+downloadPDF 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_off0000af93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF93 14528 bytes
SHA-256: 14bcb0971f7066643e678fabadff7c6d8ec1375a74e0a38a716b3de165af8b8a
font_01_sfnt_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 10608 bytes
SHA-256: 298a448ca3020d04973c10a48fd501ad3af416357bf3723bd57c22b2a9d14f8e

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