Malicious PDF — malware analysis report

Static analysis result for SHA-256 96713ee487673b59…

MALICIOUS

PDF

70.2 KB Created: 2021-09-19 10:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c71eead150fb2a6bac9d263712da8b6 SHA-1: d66cd6168a4f086b1e86242c5b6afcd993c9bb21 SHA-256: 96713ee487673b592330362772d6b06faa9b74e0d5218367313dba4dae9b33b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://coretry.ru/uplcv?utm_term=heaven+by+jaymikee+lyrics PDF link annotation
    • http://kiszelyugyvediiroda.hu/docs/file/gamaza.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907021602_27501437.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109091149457659.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/waxadenivazamatorefuwoxob.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/digiveweliduvowejotugix.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/12166185387.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/54910870647.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xeduredasutiwexa.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/77078015815.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/12941951219.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/bemibojojirufapagezokodav.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/nikatewalipogivugavu.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/2347695015.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/51086311277.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r1k2s4itehh8fhdb85vdcg1gud/fuzazarimajajitarozen.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fufudigutovidubage.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_off0000afbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBB 17004 bytes
SHA-256: 4c4219d7546a5806c011ab66c1c263f8434999883a00b87e2cf2c0d2f82b37bf
font_01_sfnt_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 10704 bytes
SHA-256: 8100ab2f4a88c9b4b20e38c358e0c66218f862aec6ddaae9f3fa2e8a14449792
font_02_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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