Malicious PDF — malware analysis report

Static analysis result for SHA-256 994d75764e1f414b…

MALICIOUS

PDF

88.8 KB Created: 2021-09-19 08:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39b32bc3a9ff9094f1e060bcaadf4ebe SHA-1: 99792f87a2f642a190e7c1447edf800aa0665ed2 SHA-256: 994d75764e1f414bf71b1e679e31a0ffd366e5f26c27a08757d0fcb7f43bfe7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=hotel+rwanda+full+movie+free+online+with+english+subtitles PDF link annotation
    • http://pnlestari.com/visitbali/image/files/16036989134.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/86608689122.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/81223070690.pdfIn PDF document text
    • http://czminghe.com/upload/files/56562344585.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/memunoxujunuterovotiti.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/82231969567.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/waduvelemaluje.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/risetafex.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/22653149896.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/vexumu.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/gesatobinesulafi.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/xawuzaboruwazopomo.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/nanapavetas.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/10047486771.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/cd3d1c99916498d8093c5e7dd0872e56/17589919660.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/94989432680.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/28912050187.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/45373974283.pdfIn PDF document text
    • http://kbchina.de/upload/10450331196.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/2446693312.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/xulebunasusevejemere.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/78686804555.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/26004217154.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 11184 bytes
SHA-256: fa5ef6b3aa866623cbef4e51e352cf2c20147658f63d28abb3a8aad5c3c98048
font_01_sfnt_off000109b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 20216 bytes
SHA-256: 86a317d82cae3251d9cdc304c05c9e02c52ef392b8d3a5d6235bccd02dc2cdf9