Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4db0f64f5920d89…

MALICIOUS

PDF

106.8 KB Created: 2021-02-28 00:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf3a5000a0daf8a8cf4c2de49b5b34a2 SHA-1: 402457f4a407319cf2cac4dccccb7a43c83cfe7f SHA-256: b4db0f64f5920d89536e5e74d8416ffb6b22aafa85536cb8f587bf3821e1ed0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to link farms or disposable hosting, suggesting a phishing or scam attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. The primary malicious URL identified is 'https://xajibur.ru/wix?keyword=insta+lean+forskolin+free+trial', which is likely used to deliver a malicious payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://xajibur.ru/wix?keyword=insta+lean+forskolin+free+trial PDF link annotation
    • http://dapajurop.mygamesonline.org/sennheiser_ew_100_eng_g4_wireless_camera_lavalier.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/metiwisivakafefiwatid.pdfIn PDF document text
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/4339295.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/wekavadomedenijenug.pdfIn PDF document text
    • https://femidizori.weebly.com/uploads/1/3/4/6/134684525/c42066f34df3.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/wigefowenibawos.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/the_ravenous_pig_brunch_menu.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/gamolaxivapukux.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/4357048.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/rekubezewafejevuxifaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujixexebekipan.rf.gd/google_sheets_attendance_template.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/gilidemoxuteponakusowifo.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/jisux.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/33073969988.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/ruposusijigekokesisuvos.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/best_answers_for_retail_management_interview_questions.pdfIn PDF document text
    • http://fanupola.epizy.com/parabola_graph_questions_and_answers.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 3252 bytes
SHA-256: 608ad8749dfc31a5c043c84ba8727176bdb83d27f04c4112dbe42f3038e99717
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 4764 bytes
SHA-256: c9615872fba4aa1fc6337a3cb702de01bd8295768e6afe8025d9c55c1d3f99b9
font_03_sfnt_off00012e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E42 13720 bytes
SHA-256: d4057b8227fefcee1db2faf6dafa8efb7b97d5a82c1cd985de8309b167a77090
font_04_sfnt_off0001594b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594B 10484 bytes
SHA-256: eb589179e21a08e305b28f4b9d0ff06cf90f809d5c1e89dcbcf9249592a59ed8
font_05_sfnt_off00017d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5C 16164 bytes
SHA-256: 967d89e51290aceb8fea09c2f9e0c707663cecf1a9b826b2128538f448fdbc28
font_06_sfnt_off00019264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19264 1736 bytes
SHA-256: 0d9b6ab0354368cdfa5a4e52e4dfb250ede80cec4283e48fafec0a3c1c1d30df