Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f4885a373a811b…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ecb27848a733bd7049340efefa275647 SHA-1: 6b67edabd6b41383f8914eb8db377998c4b4ffb5 SHA-256: c3f4885a373a811bc4c9fe54371263d870bf68444f6804791549b839aaf151ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting it functions as a link farm to distribute phishing content or malware. The presence of external URI heuristics and the 'link farm' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lica-mpt.it/userfiles/files/fufapotofatiwukojuvolavi.pdf In PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/lafesorikibilatem.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lumigomarogumu.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/18610047060.pdfIn PDF document text
    • http://glttek.com/userfiles/file/fokagimuzujeve.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/16189949609.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/93767443036.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/kopurigilipijepom.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210917063117_pvadt1.pdfIn PDF document text
    • https://yasacompany.com/upload/files/xiloxegoxaxizip.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/vepevexobeza.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/xubikubumiv.pdfIn PDF document text
    • http://humanlitech.com/files/files/21053510756.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kojuzuruwopagexug.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/934d7b108a04da28eadd272c78e1e68c/93787440682.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f028656196c031738754cdbcfd138cef/87311572939.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/tevegupufesuv.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/27451225186.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/lufusebe.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/87486067111.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/77616745314.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/20219495137.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/wokejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+rpg+androidPDF 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_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 17224 bytes
SHA-256: efafa6745ddaef634a9911eff94daf542cfbee85078cf71e2a5b153ee8121e37
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10232 bytes
SHA-256: cff811146c529cd4b5c130c204c7afcf8fd14d73d16cbdf8e4188d6d4e44a320
font_02_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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