Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba3d4b1b759a24b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 09:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94715aa9c9b37413cc333e31e5f91b71 SHA-1: 6de4b59f4ba94ac06ba60d126420fa4441ed41d7 SHA-256: 8ba3d4b1b759a24b394462a5ccb2bc22c3363ad88302a94758d10b26415633b4
126 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. The presence of these external links suggests an attempt to redirect users to malicious content or further stages of an attack, potentially exploiting vulnerabilities in PDF viewers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pobierzplik.pl/uploads/files/xasusuloguta.pdf In PDF document text
    • http://locnuocvietmy.com/Images_upload/files/kulonugelopo.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109230526217584.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/xopamesuge.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/22111600506.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/57847327259.pdfIn PDF document text
    • http://scsychem.com/upload/files/logekutob.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/54503382215.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/10825972934.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/zekazidovem.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/851830681613b880abc4a6.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/50394145980.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a222ef186004bf9864402ec9b964db77/luzivan.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/55997214392.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/loxenimasaduzapower.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/95356230184.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/15611471108.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/11928841851.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/tefuxevajujaxigug.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/92669865196.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/burulirubewoloremesaso.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/gobebutepazupiluvutiwovaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=800+robux+codes+2021PDF 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_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 10608 bytes
SHA-256: f1591f448e1fa4b8fffdef4847cf3d4188951be9afc41713e14d97b4bacb8658
font_02_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 18244 bytes
SHA-256: 8a2c109feddb6ea4f63096e996570a48b1af1f6e3cb84c05b819ee3baa5f6360

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