Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7bb583d340b171…

MALICIOUS

PDF

75.8 KB Created: 2021-02-20 19:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6b4ed455885b5f2d50a727901a42f363 SHA-1: 40623289d0c6ead683c77afca10764070653ffef SHA-256: bc7bb583d340b1714cdd19a481fef2dce41cd3c1019bff8bdb5d33ca49afa3eb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious software or extensions. Embedded URLs point to potentially malicious domains, further supporting the phishing and malware delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://maypoin.ru/strik?utm_term=dyson+dc44+battery+replacement+type+b PDF link annotation
    • http://tonagruz.ru/generic_structure_report_text_adalah6kxds.pdfIn PDF document text
    • http://tesocoin.online/worilokapizujqhffw.pdfIn PDF document text
    • http://bestsaleshopin.xyz/nugupibaduxekugopivesgq08z.pdfIn PDF document text
    • http://biomanix.best/94749952790ngc5w.pdfIn PDF document text
    • http://myfoxing.online/seccion_aurea_en_arquitectura_defini796ey.pdfIn PDF document text
    • http://shimano-stradic.ru/reading_the_world_ideas_that_matter_with_2016_mla_updatefz6pb.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/hGo0KkI/17659724603.pdfIn PDF document text
    • https://cdn.sqhk.co/bawivurolut/HgeQhjc/classic_phoenix_arcade_game.pdfIn PDF document text
    • https://cdn.sqhk.co/gokovolasula/cE1LidD/wegebenaraxabawonomekil.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/ibgijjL/microsoft_to_do_list_chrome_extension.pdfIn PDF document text
    • http://gratoramaa.website/162485794314dzhq.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/iieNghO/11462544852.pdfIn PDF document text
    • http://temppicture.xyz/91093307652rqx1z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vunizi/child_custody_agreement_without_court_template_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/cade_simu_3._0.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/71781413664.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/rumukowutoredutipij.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 5548 bytes
SHA-256: 1d1c8c7347e9624f6cdf1a9b649eaf732deb30fcdced8d8050955d6cffad4dfd
font_01_sfnt_off0000fccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCB 11032 bytes
SHA-256: f840304c77a63037927fddaa7573a715b4e7352a2bb378fbac3c735c22c67521

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