Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ecceb619b37b21…

MALICIOUS

PDF

74.4 KB Created: 2021-03-06 13:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: bdf723871c0729511e69b1280c3287ca SHA-1: 62b2f9bc973d103c72a02779e56ca0b38eb69c6e SHA-256: 83ecceb619b37b21a16a6260d9f7915dbccd8b59b70e2bdff16470badef1de65
164 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which is presented as an answer key for a skills practice document, suggesting a lure to a malicious site. The PDF also contains a large number of external links, indicating a potential link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jacksth.ru/award?keyword=8-1+skills+practice+geometric+mean+answers PDF link annotation
    • https://cdn.sqhk.co/tutabalero/ePRAxkE/beririx.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/maNgjbn/85862165688.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Ygfhd1h/free_among_us_walkthrough_in_sheep_s_clothing.pdfIn PDF document text
    • http://radulukolataleb.iblogger.org/nokaxiwaga.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/Hbgejgq/betemejepoka.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/eejcWpf/zutopoxemoxikazirisopejen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_33b5ea85d43d4390bc0fadccd459b125.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_8083dd29748944a682f3d8630a991f5d.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_2a80da3f10794006ae68668753e2ad1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/banner_life_insurance_company_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/nafolawavowojuzewuzuva.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/56459505958.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/2315773866.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/zixakitola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdbff6f6-b3c8-4fac-b91c-f520e03392d4/nikibokukozapub.pdfIn PDF document text
    • http://gikisomu.epizy.com/25769436581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387add08-6ea8-4253-a5fb-d710df328ae2/89569217280.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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 5592 bytes
SHA-256: 313dd3df6c73b1f6f90c3da6f4cf18381003564e92b98aca50cc5a6e293b817f
font_01_sfnt_off0000fa46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA46 9972 bytes
SHA-256: 285228737d91601b48149d75d80facbfb72c7a3485dbcc3f82516524d2d8a90a

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