Malicious PDF — malware analysis report

Static analysis result for SHA-256 961891840f30b600…

MALICIOUS

PDF

77.5 KB Created: 2021-04-03 04:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06d71e6176c0d72205dadb56fc77352c SHA-1: 43c7fd6703f165bedec900f55212f5dddea056c3 SHA-256: 961891840f30b600e51e404b740dc426986616adee99424e6791858184fe795f
96 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 an embedded URI pointing to 'kuzutuzo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'A level biology exam questions and answers pdf'. No scripts were extracted, but the presence of multiple external URLs indicates a strong intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=a+level+biology+exam+questions+and+answers+pdf
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/57c2132.pdf
    • https://gobadinemi.weebly.com/uploads/1/3/5/2/135299992/1037335.pdf
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fd68ad85d850.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/29727644935.pdf
    • https://karopokonu.weebly.com/uploads/1/3/4/5/134519394/2525131.pdf
    • https://static.s123-cdn-static.com/uploads/4369313/normal_5fe136a195870.pdf
    • https://kepiloxuxamife.weebly.com/uploads/1/3/0/7/130740378/satupekekusiziv.pdf
    • http://dinewegivogofe.mygamesonline.org/22716021555.pdf
    • http://gepexoliv.medianewsonline.com/lugunisininum.pdf
    • http://wovugikanagak.scienceontheweb.net/lightning_protection_zones.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_605b1fc80df6d.pdf
    • https://static.s123-cdn-static.com/uploads/4446283/normal_5ffcc32c4ddca.pdf
    • http://fuwiduwoxobol.mygamesonline.org/diagnostico_cancer_de_esofago.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e45a63ee-4d97-4980-a929-1cdbf55d9b8b/how_to_fix_a_leaky_kohler_single_handle_faucet.pdf
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_32628dd617d648d39e8bd4aee91676cb.pdf?index=true
    • https://s3.amazonaws.com/pokixovuxik/jabaminodiginixamu.pdf
    • https://uploads.strikinglycdn.com/files/1e2f6969-ba8c-4a2a-b30f-c56b77ae8a95/ragejal.pdf
    • https://uploads.strikinglycdn.com/files/60a31b77-8c0a-4b15-b44e-2724884c5fdd/25422399628.pdf
    • https://s3.amazonaws.com/fizaxo/sadda_adda_movie_song_in_320kbps.pdf
    • https://s3.amazonaws.com/zexozavo/servicios_integrales_de_tecnologia_informatica_sas.pdf
    • https://s3.amazonaws.com/fidefofudi/hp_deskjet_3050_j610_wireless_setup.pdf
    • https://uploads.strikinglycdn.com/files/6f2c3ab8-40fd-4ade-b990-21a4fa5ca39d/unwind_neal_shusterman_wiki.pdf
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_7819878814ae4a8498b83b4005d521d6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94d9d03a-693f-4387-be31-c679abd542d0/what_is_the_organizational_structure_of_a_nonprofit.pdf
    • https://s3.amazonaws.com/vogubivajavofu/buckwheat_noodles_nutrition_information.pdf
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_f6241756b813401f822715d30ee89391.pdf?index=true
    • 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_off0000ef7f.bin
071191e780c3cbd728a4db9e348cfffd1acc767fa11a62ec99dcc369fa5fcbe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 5936 bytes
font_01_sfnt_off000103b0.bin
3a1de1c29ae35028abd6c18960d6a79a99b7e6552caf649f6750c6d6d19fecde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 10816 bytes

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