Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d8c33116ba334f…

MALICIOUS

PDF

79.7 KB Created: 2021-02-18 23:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03fe25a298023a401d5b74afac57a911 SHA-1: 497256f211a69a38b71e3a6d13fd9488d8f407ca SHA-256: 40d8c33116ba334f0e2156e998c04a8cbdb23ffc555985695c863a53ecbe32e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by multiple heuristics, including a critical finding for brand-impersonation credential phishing. The embedded URL and the ClamAV detection name suggest a phishing lure, likely aiming to steal user credentials or deliver a secondary payload. The PDF structure and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/mefebokopud-jiposufepedeser.pdf.
  • 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://seumenha.ru/wix?keyword=checking+your+browser+before+accessing+gitlab PDF link annotation
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/mefebokopud-jiposufepedeser.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5fef6806bc60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_601f07afab898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_6015bd1fd6bd9.pdfIn PDF document text
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/1489ae27c7529ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fdfef4c72713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6028e41cef4ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447258/normal_5fcd0f2a56fbe.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/mezazedeniw_kejave.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
    • https://s3.amazonaws.com/rijaliwiguvex/46158409223.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/sankarabharanam_movie_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/google_chrome_apk_for_android_box.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/public_finance_and_taxation_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/fivezi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/free_video_player_for_ubuntu.pdfIn PDF document text
    • http://mofibukuzoke.rf.gd/bukunmi_oluwashina_audio_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/bhakti_song_dj_tinyjuke.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 5444 bytes
SHA-256: a92211f1556ddbefcf5cbd531644275d70900eb69d5c35b9c9745d7d356a73c1
font_01_sfnt_off0000f521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF521 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 10720 bytes
SHA-256: a93acc3970695cf0e4433a094e133512f2c18754f00d5dd4676dcedbf7352740
font_03_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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