Malicious PDF — malware analysis report

Static analysis result for SHA-256 f999423b7a74fb88…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 00:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa6961f7b5a5390d3c611cc80d118ea4 SHA-1: b34e40ddbbac1ef68eef99f1377cb2c34460a5e6 SHA-256: f999423b7a74fb88ef4acf0ad08613701e02b63526a5d77de2e5631b3d6c7356
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to malicious websites or facilitate further downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct, low-reputation domains for hosting content, often with UTM parameters, which is common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://synerhu.ru/uplcv?utm_term=cashzine+apk+download PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe0a27566---24643001127.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/98894269167.pdfIn PDF document text
    • https://tadimtursu.com/image/files/12248837971.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/wakoxavo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/perajalapusumadoz.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c5b52546---22747499020.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/febatoxumamotex.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210911053751.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/ruzalexogezugiluf.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/90388942676.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/18462288636.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/zibod.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/21995018675.pdfIn PDF document text
    • http://thevalleytrader.com/files/20385216127.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/83708691372.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210906130059.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wuxozivanosazif.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/97956545072.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bopepazovodavev.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/dimozugulivo.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/tituvile.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/dowuwomodibejudekomifi.pdfIn PDF document text
    • 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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10560 bytes
SHA-256: 5a1709be650054079e1b12d3f481270fb98bc6941405fa1323e75405bfa9c210
font_02_sfnt_off00010a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A43 19448 bytes
SHA-256: 32bb69835eef9fb0428e57ac79bb8775db0f0f409ffb3541200e8b6f536b48fc

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