Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5c814f0924d94b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-23 21:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1e3343affbff016733c995163a3ee9b SHA-1: 8450877502427a79cf86a7efe12b0e35a0e985cc SHA-256: ea5c814f0924d94b7ffda5b348b86ffdeb9447ebe00aed7dfcbcf6aec7f7db87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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 http://usatovl.ru/upload/fckeditorfile/rajizujerituva.pdf In PDF document text
    • http://isdoor.ru/uploads/files/rolisemavinaduvixa.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/49124997072.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/6038159594.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/66265728594.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/zevesategitoxinatomulitan.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/72914369464.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/wejozitadisugal.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907123003.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/lowiwifawe.pdfIn PDF document text
    • http://trevorhannant.com/10427259283.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/xiserumevuzejimodaximo.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zoxedofudivovad.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/47343911116.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/remidetadomosi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/70237936815.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/kexiberolatur.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jeveda.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/latexaxabif.pdfIn PDF document text
    • http://195exim.com/datas/files/17822875990.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/30756609636.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/36648196181.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/65150962761.pdfIn PDF document text
    • http://p-energo.ru/content/file/46807972933.pdfIn PDF document text
    • http://identik.hu/editor_up/wopetax.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614576412b549---vulavex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+watch+online+freePDF 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_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10428 bytes
SHA-256: 3621d38209182469836530b03917bd92faa02e267ee13ee8006af5b1fa9d3180
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD1 18168 bytes
SHA-256: 1d947fedb3004e2e3bd64ade0160a892bda31bfc33095cfa1144b61ae43a0fa1