Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc82e03e60cf2284…

MALICIOUS

PDF

91.3 KB Created: 2021-03-11 16:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 095d779f146a4e40a7fc72d45318d702 SHA-1: 4324287b32353f0714e6c5d3c8efc38c1d17d955 SHA-256: dc82e03e60cf2284ac58cac2ec5e02bf6ded9ad7893ced9460185d2486ba013c
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users to malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to free PDF downloads, aligning with a lure for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=sinhala+astrology+books+pdf+free+download In PDF document text
    • http://revilokepudidu.mygamesonline.org/duxutapizagasif.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/behavior_intervention_plan_sample.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/doparulajufi.pdfIn PDF document text
    • http://takinodexitimax.22web.org/94695298707.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/will_titan_tips_fit_graco.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/hampton_bay_window_air_conditioner_not_cooling.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/68306133748.pdfIn PDF document text
    • http://ruxenawuxovogu.getenjoyment.net/sri_rudram_namakam_chamakam_telugu_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe3b05c-fa40-44fd-8f01-a8c8d9a3547a/fundamental_theorem_of_calculus_part_1_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af62863-f772-4b49-a125-44b3bdd2646b/murray_rear_engine_riding_mower_for_sale.pdfIn PDF document text
    • http://sasugokomelu.rf.gd/calculadora_para_pasar_mililitros_a_gramos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a52669-d690-4fd7-9404-cd7f23ddf1bd/plantronics_voyager_legend_bluetooth_headset_connect_to_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb56856-ebf0-44db-8d1f-3920d9ab1de9/32801242234.pdfIn PDF document text
    • http://vuremekewema.rf.gd/lirewalu.pdfIn PDF document text
    • http://sokevigaku.rf.gd/82752373931.pdfIn PDF document text
    • http://fosadexovoz.epizy.com/48997502596.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/botejubonamolevimijenewap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b43fa5c-f562-4e37-a126-f93c42fe5fee/borisudidamirebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f8edd1-91cd-40b8-b1ec-b2dc50a75035/best_niv_bible_app_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2353c2-c6d3-43b3-83c0-d037e639ea11/best_west_coast_playbook_madden_20.pdfIn PDF document text
    • http://nabaxaroxofujo.epizy.com/71187020908.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://scripts.sil.org/OFLIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 5804 bytes
SHA-256: f7056c26cbcb186d34e1ee2460e56682feb685b8c01cb9deefd87e40a50df959
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 24464 bytes
SHA-256: 754a57217a086cc64d28a14c75325d4a35d95c212009819b174ec98e911324f4
font_02_sfnt_off00013d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2E 9972 bytes
SHA-256: 33be9037e39733cddcd294b466a00d01721cd9aa28b7a3627df9acb89df1746f