Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3bb9044f9f8f4f…

MALICIOUS

PDF

76.0 KB Created: 2021-09-22 15:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af170af7650edad6418f1b616cd451cd SHA-1: c58939fa41234d33a4cff28c0f8fcce965e2b698 SHA-256: ec3bb9044f9f8f4fea3164c120c425a9c58f8f7851acb7f789701361fc0c2e77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URLs are embedded within the document, indicating a likely attempt to redirect users to malicious sites for phishing or malware download. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://cructi.ru/uplcv?utm_term=cracked+mx+player PDF link annotation
    • https://smgbid.com/ckfinder_userfiles/files/xukila.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48870983285.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-13/20210913171611819674.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/dizigumez.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/xunapawamagi.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/vebijos.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/92718243723.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/tedajitopavalap.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/75114857873.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/8480140482.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nipuboletaxe.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/9cace0548151039f558e7df1d020645d/66688002016.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/29213244144.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/6957800403.pdfIn PDF document text
    • http://poorclarescork.ie/images/kewapiluxuxevu.pdfIn PDF document text
    • http://parilka.by/var/upload/file/nuretuwunove.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/zodawazokejoj.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/50991088553.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/40997232703.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/jaforijupurudukejew.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/mumitaramajimenibeselefaz.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/sinavabasunugupexunozu.pdfIn PDF document text
    • http://humanlitech.com/files/files/vojizulejavojevusunij.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/tutosu.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_off0000c632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC632 10432 bytes
SHA-256: 89e5b510ddbe7b6d056393be56c671c7f2b2050c12afd3d102b819b96e8d9597
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 17360 bytes
SHA-256: 2375e64eaabc5dff7cb03e4720d3d59555f6b6b01f5b5ad7b144a7a1aab3c5d1
font_02_sfnt_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1