Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbec752be8e3b1c4…

MALICIOUS

PDF

79.8 KB Created: 2021-04-24 16:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 84e3ab8a8bf48e50763bf03d1ec801b7 SHA-1: ec84a1ffbbbe08083dfe66a1e6bd29f5663eec74 SHA-256: fbec752be8e3b1c44ee5720a932cffd4e04315792728a40f40b810155bc715d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to wkhtmltopdf and creation dates, but the primary malicious activity is driven by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://midufefew.ru/strik?utm_term=when+should+i+use+commas+and+semicolons PDF link annotation
    • https://rajajedoweji.weebly.com/uploads/1/3/4/3/134310645/nunase.pdfIn PDF document text
    • https://libodarupebixab.weebly.com/uploads/1/3/0/9/130969674/6440258.pdfIn PDF document text
    • http://welutotadaxol.iblogger.org/biology_a_level_coursebook_answers.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/surularivenut_xidogababola_pugakudag_mametewaxoj.pdfIn PDF document text
    • https://dizusama.weebly.com/uploads/1/3/4/7/134730201/2786329.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/dutanezetoresinafa.pdfIn PDF document text
    • http://reactivaperu-2020.com/lizimotytxme.pdfIn PDF document text
    • http://watomidipokaki.22web.org/carmel_by_the_sea_restaurant_guide.pdfIn PDF document text
    • http://seweripuwas.mywebcommunity.org/antes_de_que_sea_tarde_leonardo_dicaprio.pdfIn PDF document text
    • http://nujagexurej.medianewsonline.com/catalogo_hinode_2020_ciclo_4.pdfIn PDF document text
    • http://itdiscounts.info/62629035529gyzud.pdfIn PDF document text
    • http://texivej.sportsontheweb.net/19616237675.pdfIn PDF document text
    • http://fetesitomer.mygamesonline.org/subclinical_atrial_fibrillation_and_the_risk_of_stroke.pdfIn PDF document text
    • http://verifybadgehelp.com/samsung_s20_ultra_512gb_release_date_australiavibf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwegovufa.epizy.com/speculation_and_hedging.pdfIn PDF document text
    • http://fozagagubimamow.epizy.com/latitude_longitude_app.pdfIn PDF document text
    • http://litaxuroba.rf.gd/mekapaluwada.pdfIn PDF document text
    • http://ruvowepager.epizy.com/71919519213.pdfIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/what_is_the_difference_between_manual_dexterity_and_verbal_skills.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 3092 bytes
SHA-256: 8fedf83148a78bbf059abbbbd7b22f0256d0266240e9913446cefdb1a629cd89
font_01_sfnt_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 5096 bytes
SHA-256: 302b4c58546b9ba8bc6c25fe82f3f61c88135fd0c31254a73aeb095b369e297a
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 11236 bytes
SHA-256: d82a7a49d505aa882ee1a61ee04dab7cdb124bcaf541d5affd22b5f6a894cd33

Open this report in the interactive analyzer, or submit your own file for analysis.