Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bf98eddca3e794…

MALICIOUS

PDF

75.2 KB Created: 2020-12-17 07:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 72c6c2f882db5611749f83ad6d1ca7bb SHA-1: 8487aa79914fdee8fac501721b89839ebf7a3017 SHA-256: 50bf98eddca3e794ccf75e5fd0b90851f7be57c41434fcbec4b422b5706cb525
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to a potential software download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?utm_term=bubble+shooter+mod+apk+2019 PDF link annotation
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/sejebawese-xiwow-dosokuzuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409250/normal_5fdaac9fb0514.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/b52095a5e.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/xuxomoloxub.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/zibenoroduzuw/benefits_of_technology_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b07617c-cbbd-4273-840d-2fc4e7b587ba/hobart_handler_210_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/weight_loss_diet_plan_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/bairavaa_songs_kuttyweb.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb456b97992eb55c2a22/t/5fc15bf018e72e5fdb0a4d8b/1606507505409/demand_draft_sbi_bank_dd_form_download.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/manual_taller_citroen_c3_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/holding_the_man_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56dd954f-af69-41df-ad37-ec320209e078/dosexu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 5936 bytes
SHA-256: 6a866f362d88f7245d9f8dc4498187d3dd8fd74127abac264ef6733498ca3d91
font_01_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 11160 bytes
SHA-256: 79aba3dfcff8291a03d6e474eaaa65969c7b059d5aad78a73c3d2f38c422460e
font_02_sfnt_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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