Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee33ab90578477b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 01:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b92586aff076ed2d1b9e9e524440b55 SHA-1: 87773865776f4783c6716dad8c306ded7162a5c4 SHA-256: eee33ab90578477b1fc2d9c1a179e70cb3aedcd2d9b31327d5c5eab44f05c2cc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating embedded JavaScript and external URI redirection. The PDF structure and numerous external links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. The embedded JavaScript is the primary mechanism for executing the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://getrade.net/uploadfiles/file/zegij.pdf In PDF document text
    • https://dennismaloney.ca/upload/editor/file/demip.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/nesumogibevigekasabutob.pdfIn PDF document text
    • https://beaszemin.com/files/79447825538.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/58292932264.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/jemizoji.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/bugezo.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/wetizopakekekiwox.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/bijojezafoginabav.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/sirab.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/kagorepebuxewirigominix.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/riwubigaviwuzusitazi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134062e13232---31206335922.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/66456344560.pdfIn PDF document text
    • https://aaaxxion.info/images/file/86141578986.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/78165759966.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/33699255123.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/70201290470.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/22d484fcc9b78da6b91b56e4bd9a8c71/68343222170.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/mowalawewe.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109041124372096.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/zimolivutavuvo.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/jeburuwilagifumad.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/98946941305.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/didujedenebimelunuzevasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=zaloha+kontaktu+androidPDF 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_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 18772 bytes
SHA-256: 1add9ea0b7642a3843ae059324452783d6b24e8119cf82e373d8598925cc0664
font_01_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 10200 bytes
SHA-256: f23bdfda9dd046c457f2a9a23fc149779da0f37dafde3648062639e542e8d9e0
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1