Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37dc6bfa57d1385…

MALICIOUS

PDF

70.7 KB Created: 2021-03-31 07:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b08c9d6430fc226579beca19f249c0 SHA-1: a2766061e6f83d350b1077d255dc6c6cb7f0e0b6 SHA-256: e37dc6bfa57d13859edfe521f3e209184eb1beace336b3886b196c7a1c3bcd07
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware download site. The document body, though heavily obfuscated, suggests a lure related to 'physics', and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=what+is+physics+2
    • http://xafawotilujos.mypressonline.com/mubebovozegudigu.pdf
    • https://static.s123-cdn-static.com/uploads/4366956/normal_6007c90e4f0e6.pdf
    • https://cdn-cms.f-static.net/uploads/4495240/normal_602b35a6f1a0e.pdf
    • https://cdn-cms.f-static.net/uploads/4417123/normal_5fd6d6c78be80.pdf
    • http://xojuxelase.medianewsonline.com/24826476199.pdf
    • http://mabay.fun/ririnirozoovfg.pdf
    • http://dreamingdeveloper.com/givatorafoxarapujizudipo6s3vs.pdf
    • https://cdn-cms.f-static.net/uploads/4477386/normal_6038e26c33cf5.pdf
    • http://it50save.info/true_blood_season_4l5zwn.pdf
    • https://cdn-cms.f-static.net/uploads/4403681/normal_604477a8a99d9.pdf
    • http://theharaka.online/you_will_be_found_sheet_music_musescore7kvab.pdf
    • http://ompala.store/naxijosomewefakamuvuu4tyg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a246aff1-6a8e-445a-95d6-1d2b64b3eec8/listen_definition_synonyms_and_antonyms.pdf
    • https://s3.amazonaws.com/mupukesunobaga/bls_indian_passport_renewal_application_form.pdf
    • http://femagela.myartsonline.com/practical_reliability_engineering_solutions_manual.pdf
    • https://uploads.strikinglycdn.com/files/98992e83-cad6-48d0-9fe6-9e5d93963334/what_exercises_improve_grip_strength.pdf
    • https://s3.amazonaws.com/posaxugidut/45780010179.pdf
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_3c8cd4c6807743be9322e0734b6ab955.pdf?index=true
    • https://s3.amazonaws.com/jenagubadopi/49910899899.pdf
    • https://uploads.strikinglycdn.com/files/724388b4-f39f-4b70-9ba9-bd4b569c39ea/hieroglyphic_dictionary.pdf
    • https://s3.amazonaws.com/sefabe/pubuwinovobisive.pdf
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_be17a65feba946d1bb81a4e29a5722be.pdf?index=true
    • https://s3.amazonaws.com/kizugokofo/audio-technica_at-lp60_usb_usb.pdf
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_ca2ead97f27844579174695606b296ff.pdf?index=true
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_265a018d2f8f40b382d4f61ecdf59ccf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea6f0398-3f72-4b2b-8a34-43feaa05395a/yaesu_ft-897_manual.pdf
    • http://solarujarinobo.myartsonline.com/vipifupanojilirogaf.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_off0000d833.bin
1b9c6ef5118179be04498e2bef1de6bb353cc9ed85812e5f70603dcbe503abdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 5140 bytes
font_01_sfnt_off0000e9cb.bin
0ed2b7b629966259987fdc659e1ef62578d6a5a59e9fa3d29226a3a9ec918c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10456 bytes

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