Malicious PDF — malware analysis report

Static analysis result for SHA-256 8737a413e8239d17…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 09:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 3c5ee068dd644fda05c81ceab59bed92 SHA-1: 6ade3120868cb8cc675a1a0cf895f112ca155684 SHA-256: 8737a413e8239d1773967cec5de4c698cd3b3f7e3dae2d2daaf69e4658b191ed
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://lso-msm.com/userfiles/file/39027723118.pdf In PDF document text
    • https://masukpt1.com/contents/files/44682079473.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/25776688188.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/welerewet.pdfIn PDF document text
    • http://envigest.cz/upload/file/wonuviwuparojotuxumoxuk.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/99913720361.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/53739243582.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/95841225433.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109100612408130.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zexikalibejila.pdfIn PDF document text
    • http://strandedtattoo.net/file/wemajej.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/60200240152.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/xetuxuvetomaderoxerowifu.pdfIn PDF document text
    • http://hrudolf.com/userfiles/zevomezoweviludipeval.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/98768506194.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109011329494184.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/kodimojagumaxuforizaguzu.pdfIn PDF document text
    • http://irollee.com/userfiles/file/92264371743.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/82161544728.pdfIn PDF document text
    • http://chromavials.com/d/files/zifulikeliketipusiwifo.pdfIn PDF document text
    • http://drtamerturan.com/file/30250006225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=giochi+android+offlinePDF 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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 17868 bytes
SHA-256: ac355d6c248b90bea8d0b6a3905f658f1d2933c2417188ac042efff63a0e39dc
font_02_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 10348 bytes
SHA-256: d93c5635c1c03985eacf328a258d3458bb26b8c5076fa3f174e1059aaaede1cf

Open this report in the interactive analyzer, or submit your own file for analysis.