Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6529f86ece65a2e…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 11:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 602327d2ff538cb5e72a8053b1927ccd SHA-1: 318c746f8950cf0f7bd0aaa947f0f859e53f2af8 SHA-256: e6529f86ece65a2ea754f6d80841432846d746d2270d6692c4cea4f6b7f58e50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crysiq.ru/uplcv?utm_term=causes+of+red+moles PDF link annotation
    • http://client.diffuse.info/files/sazur.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/rokexosulenubawagisizu.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/tejowukemavajoke.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sooqb84l6cag1s2ov98gshuoi3/pekigigurasi.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/18857751742.pdfIn PDF document text
    • http://cochemical.com/upload/files/52701168660.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/10100283095.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/83455439206.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/97885141728.pdfIn PDF document text
    • http://www.bash.cl/media/file/lavefinivoxizazisag.pdfIn PDF document text
    • https://devismesport.fr/userfiles/file/26583563559.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/lapuvumiriwatomobusi.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rusenemidevomebekodexex.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/ziraludowozudupadijad.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/4759991035.pdfIn PDF document text
    • https://electroagro.es/pub/files/99815073744.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lowujukufuza.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/40244466262.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/raruv.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/41419068240.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/99199708326.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/5400686035.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/xasigawuvekuweko.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/9911931713.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tm4gmec5odvu0qha72i4534jhk/17100774455.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/ditixajo.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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 10352 bytes
SHA-256: 028176f2ce05826cc6a393d3080bd16f515ff8937eccce98780a65205a87b8c6
font_01_sfnt_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 16356 bytes
SHA-256: dcbe455080e1958945e199ac2b54fe93f595461c6bf3734c2020fc123dd69020
font_02_sfnt_off0000f583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1