Malicious PDF — malware analysis report

Static analysis result for SHA-256 38373fe4e33c6fd3…

MALICIOUS

PDF

81.9 KB Created: 2021-04-12 00:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bcf939c2ab67d3bca9d311633d8d7715 SHA-1: 9a630c3eec2db24c851522ede7283bc438561f38 SHA-256: 38373fe4e33c6fd3035bfc4b16b3010599ddb68aef7e41de3d4271684c84f13e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/strik?utm_term=clr+via+c%2523+5th+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475564/normal_606a20b392f97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5ff2dd40b6346.pdfIn PDF document text
    • http://retamos.mygamesonline.org/guitar_songbook_tabs.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/cloud_architecture_patterns_book.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/metabolisme_basal.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/forever_war_series.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/runifasofujufibil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_6028152b6cc73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421329/normal_6017164f367d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fe368795c315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503987/normal_5fd5f8430eebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_602452f3c8c7a.pdfIn PDF document text
    • http://zuzezolimo.22web.org/sap_inbound_delivery_handling_unit_table.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/34882966680.pdfIn PDF document text
    • http://rowewuxeg.getenjoyment.net/zilun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498868/normal_603ee6f9ee909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_60260124354a8.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
    • http://baxewape.myartsonline.com/digunezebewofujedule.pdfIn PDF document text
    • http://vodepafituxeta.rf.gd/dividing_exponents_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/pentair_superflo_vs.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/cardinal_numbers_worksheets_for_grade_1.pdfIn PDF document text
    • http://vulawogini.rf.gd/binomial_logit_model.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 4072 bytes
SHA-256: d2e564f8b0917f130f42e341743ee67622a425b80f065d1728d90d00b80d400e
font_01_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 10944 bytes
SHA-256: 51aad55b670f3b0064b52863efac210793a3954df201d2d048d9a324e1216c6f
font_02_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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