Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fde20730e3ca40…

MALICIOUS

PDF

77.4 KB Created: 2021-03-02 15:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b8ac4b43ba2355c2725afd19c28498 SHA-1: 8ea37016b533199d97b8ff5fd655f1f35d911bfe SHA-256: 71fde20730e3ca40d19f4178bdabc422b771b1415e8f9b884614fcc5e64b60bc
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. While no scripts were directly extracted, the presence of numerous external URLs suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=2007+starcraft+travel+trailer+for+sale
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/8233231.pdf
    • https://cdn.sqhk.co/jevamivuvugi/eiaNAjj/free_crafting_and_building_games_pc.pdf
    • https://cdn.sqhk.co/tibakekavero/vgijhzl/44249497926.pdf
    • https://cdn.sqhk.co/businaxidare/icjgXhi/evolution_2_battle_for_utopia_mod_ios.pdf
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/datavovowu_mopaxab_wobiliziw_kudoda.pdf
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/pelepazutimude.pdf
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/3bf11a.pdf
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/1cdd55.pdf
    • http://xafukuxovikovu.22web.org/bachelor_of_business_information_systems_in_canada.pdf
    • https://cdn.sqhk.co/tovisegag/EShaAun/rugby_league_grand_final_2020_score.pdf
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/2820340.pdf
    • http://fumaposowev.22web.org/appsense_software_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kevixavi.rf.gd/ameesha_patel_image.pdf
    • https://s3.amazonaws.com/zaxefemebidaz/47904795204.pdf
    • https://s3.amazonaws.com/xakajoziwibi/root_permission_android_application.pdf
    • https://s3.amazonaws.com/mudurixo/41676765399.pdf
    • https://s3.amazonaws.com/zesixefe/how_to_learn_computer_programming_for_beginners.pdf
    • https://s3.amazonaws.com/kesumasaka/cot_report_forex.pdf
    • https://s3.amazonaws.com/xuzed/bajosavupamoladerogolox.pdf
    • http://solazum.epizy.com/82293892229.pdf
    • https://s3.amazonaws.com/nosepevozux/insulated_concrete_forms_training.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef55.bin
6cb655be190ff63912f738658f907a020d782a28a93580780e75aae49b8bf3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 5192 bytes
font_01_sfnt_off0001011b.bin
cae11fbfefcd8bd512c989199bdc09e682a9af4726f432d7ecf005b82232957b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 11368 bytes

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