Malicious PDF — malware analysis report

Static analysis result for SHA-256 d270537b342ccb15…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 08:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4fe11e99cc991c9059028ea6a275ac86 SHA-1: 2c5c6e614af4463c90ec20d6a32075c3f2b9cab2 SHA-256: d270537b342ccb151f6dfb772f2bf48fbcf8116f292fc0fcd7447f6eedb60b5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tiendanatacion.com/noticias/files/sidaruvevizafiwuz.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vllcs5k4k7r77m2ohrpd9qd3jq/repazapexilos.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/36999022293.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/84011652394.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/43719340038.pdfIn PDF document text
    • https://tomas-music.com/contents/files/jadadijire.pdfIn PDF document text
    • http://hjhchem.com/upload/files/71276089385.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/4160301469.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/gujuzatuga.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/71357791471.pdfIn PDF document text
    • http://voijin.com/userfiles/files/vaxugesotijari.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/26865120343.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/60860398532.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/woxexekasi.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/95048352763.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/kakosexosad.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/miberirijifurapekewate.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/volobini.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091404243773499.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/83318634777.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/51925391313.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f727a0b3b---xurafipivuz.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/werujub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=current+gdp+ranking+of+countriesPDF 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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 10972 bytes
SHA-256: 64d87b65e708363ebe28b826f8441bbb3d8415b176d02f653869a1f68dcab4e4
font_02_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 16452 bytes
SHA-256: 904fdf3f0c318765603f61d599de2380ca65f68840776b2be3b228a50c67262b

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