Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f71f7ff0c778ed…

MALICIOUS

PDF

77.4 KB Created: 2021-04-17 23:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0f13f5acf35d8785fd6a0c36f3b6d525 SHA-1: dbb13fde85ae62c9ab17358f48cba4976f4251a0 SHA-256: a3f71f7ff0c778ed6d47ffe7273c5961b4e3bb5f5e83671eee179c03d8f7acb7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains a search query related to network device passwords, indicating a potential pretext for phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=motorola+sbg6580+default+wifi+password PDF link annotation
    • http://torchland.xyz/47642045022bfwm0.pdfIn PDF document text
    • http://kismykeitio.best/what_does_charter_ref_code_s0900_meanr11l2.pdfIn PDF document text
    • http://azakalaza5.xyz/fabigorimewujuribupoti1t6o3.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/sogudoxevogulogofifok7v659.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/cx2Djju/38756022054.pdfIn PDF document text
    • http://hamlikjorettoop.ru/6962353831izcjl.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/R7NuDig/94668661602.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/cv6Ghg8/aaron_s_department_login.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/wjfhfmj/wifi_file_transfer_for_pc_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/c1XVMgi/sitiguxokoraxenuvizinin.pdfIn PDF document text
    • http://gnoogle.site/download_filme_furia_de_titas_1981_dubladowcn8m.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/end_of_days_soundtrack_cdbu6qe.pdfIn PDF document text
    • http://tajupodibo.iblogger.org/bsphcl_holiday_calendar_2020.pdfIn PDF document text
    • http://tryse.xyz/suzuzajafemaluvekofewegyqj2.pdfIn PDF document text
    • http://uscreditmonitoring.info/jupatunudaminixujuga13dmh.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/5bcbaab9-6cf4-47b6-8e34-73a2f951c816/jawuvonilagameze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b56f13-2437-477d-af57-6d357889fb6a/nuzesutumewanoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/jawumanap.pdfIn PDF document text
    • http://xugibomexepef.rf.gd/java_tutorial_bangla.pdfIn PDF document text
    • http://dofogemus.rf.gd/jejok.pdfIn PDF document text
    • http://matixonapoler.epizy.com/types_of_cascading_style_sheets_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/honeywell_th5220d1003_non-_programmable_digital_thermostat_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/first_rank_raju_movie_telugu.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_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 6060 bytes
SHA-256: 64207191afe70fbc1bbe6c38b8bc54f06b533afe7142a276bcbaa3d3d9a3273c
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 11412 bytes
SHA-256: b037639d6aeafdbb5da3fbd0d09dd02e02e469e5880510b61d0affe7671aafd3

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