Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dfc0afa221cde7…

MALICIOUS

PDF

76.4 KB Created: 2021-04-18 06:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab5ac555942a8ee6a48e800946ffd911 SHA-1: ee79d5cbec52dd0494a2fa935aeada0062f29301 SHA-256: 76dfc0afa221cde7479adb6526226dc6600bad9edb3b8eedd2df9de2add94989
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though partially corrupted, contains text related to installing 'john the ripper' and mentions 'wkhtmltopdf', suggesting a pretext for downloading and executing further malicious content. The presence of an external URI pointing to 'maypoin.ru' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://maypoin.ru/strik?utm_term=cara+install+john+the+ripper+di+termux PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5fcca8ce14f8a.pdfIn PDF document text
    • http://sigevomub.22web.org/introduction_to_applied_math.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460471/normal_606c6d3ee3c94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408702/normal_5fce948a40308.pdfIn PDF document text
    • http://debugor.iblogger.org/22065783930.pdfIn PDF document text
    • http://lojapunerilifev.22web.org/lolerowenoz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbf4910-eea7-4096-9fde-fd2b7d03fe8d/zijaxabow.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/can_you_use_a_black_sheet_for_a_projector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707d5a89-f92c-4aa1-bc8b-ee6a361cf209/the_wonderful_world_of_dr._seuss_20_books_box_set_-_ages_0-5_-_hardback.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/bavadofitafipasepogom.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/moto_g_3rd_gen_wireless_charging.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/ponerazitifazujojaxaji.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/hotpoint_self_cleaning_oven_symbol.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/hazardous_waste_management_training.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/25412160651.pdfIn PDF document text
    • http://wokoxut.epizy.com/puxugilanilanajome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ebdf923-b5ee-4f3b-b4f0-f925ab6c49ad/what_is_the_purpose_of_associated_press.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553e8941-cdd3-4407-997a-8be95d1d8a4b/zunubilikidebunuwefejati.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/11146040546.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/75175283167.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/59305673579.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/jixofusarowupe.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5248 bytes
SHA-256: c925f4db4bdc671e96ad99a99a5264dc2f30d9ea4908cbc1ec353270d4cc9750
font_01_sfnt_off0000f9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 11992 bytes
SHA-256: a4a6a7d51afeef7f7a5e22cdd6d2d7148e99cdb5078115ad322f6682188c6030

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