Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef49bfcea5e136e5…

MALICIOUS

PDF

86.1 KB Created: 2021-03-24 05:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1e8f4b9c17c2570290abb211842b56e0 SHA-1: 3677f81bd3f9fc5c93695adf7c76241efbba982a SHA-256: ef49bfcea5e136e53e8afb888b86d63da4c24f1277bea5de3065ce83a06a27ed
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that masquerades as a homework answer key, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it is designed to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://mezovuduw.ru/wix?keyword=stoichiometry+homework+packet+answers PDF link annotation
    • https://cdn.sqhk.co/xomorenut/ghgficU/kasokiriramixukefukixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_603d6fb2a5d03.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/ggBMi32/rubenovi.pdfIn PDF document text
    • http://mazezoda.22web.org/how_to_overcome_emotional_abuse_from_father.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/Qge16ib/26474351593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446400/normal_5fd9fb53319a9.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/iajehfV/sazoleruma.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/4cZTCU6/lep_s_world_3_10-_19.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jjdP4n2/cyberpunk_hd_wallpaper_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_601eb21d6d15d.pdfIn PDF document text
    • https://cdn.sqhk.co/dofewijoras/gVghyhj/mustang_horse_running_fast.pdfIn PDF document text
    • https://cdn.sqhk.co/jejefudebuxi/geiaPhj/death_killer_guarding_the_city_mod_apk_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vobafuge.epizy.com/cours_anglais_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51ff2b8-27d7-4066-8e8a-30667a2f1484/51690716490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1c355b8-88de-4e91-8a56-30a4245fe538/what_is_the_exterior_angle_of_a_25_sided_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565a8933-6330-4ba0-a5c6-95529903d6b4/how_to_make_papa_johns_thin_crust.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a4760c-b189-4fdb-b6cf-0c9efb32325d/fofuxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb42759d-a29e-46c7-b3dd-9a437c43dd96/munexosoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1233f5-cda4-4374-aa2a-5ce2c3159d10/fnaf_the_silver_eyes_pt_br.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 5292 bytes
SHA-256: 148aa78f44847816605cd6929768f852a13a248a233c9c7c6fb816559b7a478a
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 11176 bytes
SHA-256: 3ed730113cd9b8a3944383424ad505ebd3882020df09050e683bfd8323e7aa95
font_02_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf
font_03_sfnt_off00013adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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