Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f77a2a54df1727…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 21:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc1780f0ec5cebb05abf83dad38b9685 SHA-1: 7cd41bbf157ce5bf2f4ed37193d244779cdd90df SHA-256: 25f77a2a54df17276445803e3085d0ea28a256cf6921b5b8345cccdaa99b2664
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on disposable domains, a common tactic for phishing campaigns. The PDF structure and embedded content suggest it is designed to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://keyday.ru/files/files/nuxidazonilalujuranik.pdf In PDF document text
    • https://kamwalibais.com/userfiles/file/naxonidi.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/27382261284.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///duxilokogiloligit.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/7110236644.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d370b2355f788e237595a39eee4726a0/50370979015.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/43846241692.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/18176870945.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/89433025236.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/86244774948.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9b74b3201---99712760015.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/99516983219.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/48175516434.pdfIn PDF document text
    • http://inistor.com/ufiles/files/kuwaleduket.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/64318999451.pdfIn PDF document text
    • https://tepihtrava.rs/files/palapa.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/95905376189.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/73463617808.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/6551408887.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/45002512513.pdfIn PDF document text
    • http://stylekd.ru/files/69060360683.pdfIn PDF document text
    • http://innotack.com/userfiles/file/werexojilidifitaz.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/19187733353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=three+musketeers+mhaPDF 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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 10168 bytes
SHA-256: 580376e9c6ea1da761e5fee1bc864fda1ceb9b4acfdfd1d55938416001f7d69a
font_01_sfnt_off0000ca1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1A 16508 bytes
SHA-256: a812e5ac89031a07963507a422d3dd5e3a3a353dd4c78b4491947f790a5f278e
font_02_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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