Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cfdc1126797e51…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 19:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b5f5c4eba165fcf8adaa96b866199818 SHA-1: c39db467dfeced1fec529629d8c1111652a2360b SHA-256: 77cfdc1126797e517e3a8a20360677b71f8462e37195bdc7c2a7fd2de2aeab64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting it's part of a phishing or malware distribution campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of the links as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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=top+5+mobile+brands+in+pakistan PDF link annotation
    • https://ka-base.no/images_content/file/nidogazulafemuxufil.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/532864674.pdfIn PDF document text
    • https://ahha.az/userfiles/file/11864608848.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wunodubusenifegi.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/folumupikurozonujubevitaw.pdfIn PDF document text
    • https://businesslife.com/content/files/kunivipomifobuxew.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/gulis.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/84233811483.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/devademukirobuwoxo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/dazolizi.pdfIn PDF document text
    • http://debten.net/UserFiles/File/96748290194.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/nirev.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/59713338237.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/juvigamugu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/47573556231.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/16098997794.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/megenitigawow.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161481f53910db---43004292385.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210918055608424.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6aptuj6ttcgburorfa2ojldh3/genofunizureka.pdfIn PDF document text
    • http://capital96.com/userfiles/file/98259156558.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/najarazejupugururigu.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_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 18160 bytes
SHA-256: d9cd97fc84a4137411cafb4fed19c6867f6f785f93d66e8f91c414ceb9961d41
font_01_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 10884 bytes
SHA-256: 5b373d081e17bfad5977de0a926ecd89bdb6cea66b40317695d241a91552e682

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