Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58b2bff504027f4…

MALICIOUS

PDF

75.0 KB Created: 2021-10-07 14:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e2df00862aaeaa78087e0da72cd019e SHA-1: d1b58027f9b47995c7b45f4196c1bba5818487e8 SHA-256: f58b2bff504027f454dcd20c8c4000ebc3bb8cccb14259d2a558108dffe9f33a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely leading to malicious sites. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://otomatcilarmetal.com/otomat/upload/files/34212150448.pdf In PDF document text
    • https://lotteppta.com/beta/assets/file/69122657632.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gisugaguv.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/juzos.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/88691614086.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/lepemozatubutu.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/jarolufuvegawowe.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109250438511769.pdfIn PDF document text
    • https://stopserv.ru/files/file/31416826150.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/pujovenagalagudedufodu.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/modazurebewajamogo.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135959e2c127---ruwamumodaxasopaxefidu.pdfIn PDF document text
    • https://cartolmania.it/file/rerimidonadebokusutijajur.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/tafofizeremogajaviruvuf.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/473521148.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108311748088028.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/57314964956.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/lovebamitobodupotafa.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/rilanaliwekelejes.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/82190246667.pdfIn PDF document text
    • https://hoalavender.net/upload/files/neromowenexopuveses.pdfIn PDF document text
    • http://markalikonut.com/UserFiles/file/tojodagixoneze.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/nanuvevudozilis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=number+of+valence+electrons+in+silverPDF link annotation
    • 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://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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 10780 bytes
SHA-256: 3fec5a5b3155f60a21f9202b88e10c3cfa2f7c95721dc279d1e23ddbd559bb44
font_01_sfnt_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 17264 bytes
SHA-256: c47dbc3c8d62faac02aef572c448f0639f10c18bde46b3b3c78838e34cd912e2
font_02_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1