Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b337549f38dd198…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 19:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: caa493cc868ab71ab2b3fa0cde457769 SHA-1: f2b96578df6066762946008f3ad4a3629e843124 SHA-256: 1b337549f38dd198a348a6264ee7e4f54e12e3d070689f2c138dc1c814d63a92
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on suspicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zilozoto.pdf In PDF document text
    • https://atkarisuli.hu/userfiles/file/2822018627.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/52c5f02a1b7eade9c08ad06f0318ff62/demogenit.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/47521959354.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/51928351661.pdfIn PDF document text
    • http://polkovnik.su/upload/file/81889967414.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/zudaxi.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/81707119309.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xulodosegegasemimebot.pdfIn PDF document text
    • http://elsped.hu/files/file/fetubojogofubanigep.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/87044987242.pdfIn PDF document text
    • http://glassick.com/userfiles/file/savupivejagesipeduda.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/163194372899.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vununatut.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/88662983174.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/93759479525.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/7351996933.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/74196194130.pdfIn PDF document text
    • http://ave-france.com/pics/files/kuvesufebezilolaxako.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/81626083270.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109060347064866.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/kijolixesaginofipadibabu.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/16160926213.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/wusogotejimosek.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/binivuwurojoboxixita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+blood+of+olympus+book+pdfPDF 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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 17580 bytes
SHA-256: 9efb6143f54dff5f76c72202db4e259d79a2aacb43962e0e15a8f28dbf8ef91f
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 10616 bytes
SHA-256: de3d117a2218028aa639536c58cbc554cccb77106c21a142223be2eaabbe9e37

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