Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc918ff01ceddd…

MALICIOUS

PDF

89.5 KB Created: 2021-09-21 02:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9678d19748607026b414fa1a88fa1ad SHA-1: e367f83e5aaf3e3092821f476fbb258ad7375fcc SHA-256: 41cc918ff01cedddbc5d8933b91428ac996ab140ebdf8025cf76f75806447690
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, with many pointing to disposable or unknown domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://burgaseguros.com/userfiles/file/77927332154.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6e877a5b---41930253821.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913142517914686.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/81564923448.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/kojisisubugedukotojesas.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/54632667874.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/doxafamopitatu.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/zezabanubirumilajobi.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/neluv.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c1e47bef---51229394187.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210921055011885.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/28201516413.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gubumigowumamub.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/56472415154.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/99080538447.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/78033813765.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/6375566085.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/99388387111.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/pakidek.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/68240326966.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/sajezasuvedinij.pdfIn PDF document text
    • http://uchid.com/uploads/file/3622410115.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/vaxurogepugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ferdinand+tom+and+jerryPDF 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_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10416 bytes
SHA-256: 14f9d15e408282dc0ad16064b41c57f89aaac018355c381ea16256f75e7835aa
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 18140 bytes
SHA-256: 1446edf3cc8b665819d05be0ab1eda8db77833b61fa3033170ea9409fd9a3f7a
font_02_sfnt_off0001403d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1