Malicious PDF — malware analysis report

Static analysis result for SHA-256 481e79536371a750…

MALICIOUS

PDF

70.1 KB Created: 2021-09-19 14:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3fa99c078e5bbe2497639f8c014a7eb SHA-1: d7c9ca31bb7357f365a9fc0af40a6220dd0cad96 SHA-256: 481e79536371a75094b43b66065828a446f88b73714bc267dc49ada9e2dd2b9f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code or redirecting users. The high number of external URIs, many hosted on disposable domains, further indicates a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=object+oriented+programming+c%2B%2B+e+balagurusamy+pdf PDF link annotation
    • http://www.florentmaussion.net/userfiles/File/fuzoginosi.pdfIn PDF document text
    • http://manu-transport.com/documents/file/27180020806.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406fd222ede---16616561184.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/daxiji.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7db04b9419ed7e40439460eca29ad1a4/70662869371.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/39213441261.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gatefasurimet.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xusijawo.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/58372696048.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/24412002666.pdfIn PDF document text
    • http://atamergranit.com/userfiles/file/65570589205.pdfIn PDF document text
    • https://securitydm.net/slicice/file/90167385526.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/kazeg.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/puluxeza.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/85429153944.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/8378230559.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/dazeradusasovokujugi.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/tubamob.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/52772519357.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/83675811365.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/56491271491.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_off0000b148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 11472 bytes
SHA-256: 1d950074e80c82d2e228c869780be439ae5ebb66dd021ff381a53ccbd6873774
font_01_sfnt_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40E 15100 bytes
SHA-256: 4de9721eea656b5fa7b6a80f72e993d8ca888eb6c0483430f01730f31eed53e8

Open this report in the interactive analyzer, or submit your own file for analysis.