Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe982c55cb15bff0…

MALICIOUS

PDF

77.9 KB Created: 2021-02-25 10:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ecfa6b164d318a946632db0a94641392 SHA-1: 9d8331edc2cdefaef626716b436cff5a9679799c SHA-256: fe982c55cb15bff05551cd4b86cea21b59e60989f8be00117dcb06fb51ac16fb
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://seumenha.ru/123?utm_term=hp+officejet+k8600+printhead', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is the primary driver for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=hp+officejet+k8600+printhead PDF link annotation
    • https://zupevinar.weebly.com/uploads/1/3/0/7/130739631/digavetepepegoterefa.pdfIn PDF document text
    • http://rubodexeduf.iblogger.org/kubota_bx_service_manual_download.pdfIn PDF document text
    • https://nazawerud.weebly.com/uploads/1/3/4/3/134353719/2660868.pdfIn PDF document text
    • http://bujufamamaw.22web.org/aladdin_trailer_music.pdfIn PDF document text
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/9919243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485698/normal_603132fcdfcab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fd890d810ad1.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/jutadiduvel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_5fd6ee56eb847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lunojol/10112163762.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/36508293401.pdfIn PDF document text
    • http://rimuwogiwofu.rf.gd/nonprofit_cfo_interview_questions_and_answers.pdfIn PDF document text
    • http://gefuxexo.epizy.com/reflexive_pronouns_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/10455148618.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/gezarenetufosoxugivo.pdfIn PDF document text
    • http://suwedafi.epizy.com/west_side_story_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/adobe_reader_free_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/axel_f_harold_faltermeyer.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/winchester_10_gun_safe_review.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5624 bytes
SHA-256: 97548d09920603198969b62c346a12cabd309c03c8a10ff3732834fb8c44b8de
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 10636 bytes
SHA-256: 6c12b81c2f948d696b767e163aa42eb9981bb26fd52d687de41353621c396000

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