Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a8050e41bc37b0…

MALICIOUS

PDF

70.7 KB Created: 2021-04-10 21:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ef7edbe34a3ebbc535c69fc479dd1178 SHA-1: 42d25bd4012f881eaf9aea3c76d49f8f5592fe5b SHA-256: 77a8050e41bc37b063e37ee22da06ee17a0de32c899726cb58f84e8dae2e6b5c
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. An external URI pointing to 'seumenha.ru' was extracted, which is highly suspicious. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=black%252Bdecker+string+trimmer+replacement+spool+cap+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464724/normal_6011070b31844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_60635bf0b4957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_60076ab183255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421207/normal_5ff3eaae5f125.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5fceef0008b0d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufuregebedus.rf.gd/sejarah_hak_asasi_manusia.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/67192125858.pdfIn PDF document text
    • http://pegalisijeg.epizy.com/excel_two_sheets_side_by_side.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/80230413561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c597f018-4fbb-4354-93d9-67b5e9febe8e/79043065939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdc401e-db4b-4d54-ac01-1e1286d788f6/80699896229.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/what_is_meant_by_the_term_partnership_by_estoppel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3985b339-3478-4edf-8873-f56f353a5331/48947708854.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/tabela_peridica_qumica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2795bbd9-d1c1-4b26-af9d-b077d41287d0/how_is_the_smoke_drawn_up_a_chimney_affected_when_a_wind_is_blowing_outside.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/registered_nurse_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/vakamudoxowosi.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/football_pc_games_2011_free.pdfIn PDF document text
    • http://tutazena.epizy.com/cardizem_drip_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/28475152017.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/kulenewumakowupupedexir.pdfIn PDF document text
    • http://natizat.epizy.com/46305527988.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_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 5508 bytes
SHA-256: e1036919bcfdace35afb81492d96f084c9ed2d060c97eac7d22ff6ef5b6f2041
font_01_sfnt_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 11860 bytes
SHA-256: a0e1349842076d67d7f04075066cf8f201ef0512517ba4fae16cf733fe1e6af7

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