Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbac6ad9bdf5ad5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 21:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0da82748032c5591497138161dcf1526 SHA-1: b81df032927421e62c5c6b5d0fc525cfa70684b3 SHA-256: 2cbac6ad9bdf5ad585d9f651eb399cde895c5fd7206061124e075433fd7dbf0a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link farm detection and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute further malicious content or conduct phishing operations. The ClamAV detection further solidifies its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://mecateengenharia.com.br/ckfinder/userfiles/files/wanigijutojutibosamiva.pdf In PDF document text
    • http://clubesquilacoma.com/uploads/files/35994642644.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/51632494336.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/40415888821.pdfIn PDF document text
    • http://rrarental.org/upload/file/48804803582.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/46114998806.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/fesupusamidelidumen.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/vavatexebojugi.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/fekesaropozarudab.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa421a7a3---68289658632.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109080802022281.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/fugatova.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdd8ee7c5---lonikodejewufefapasuja.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210911083623.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/15820768540.pdfIn PDF document text
    • https://raljob.com/userfiles/file/97891970862.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/40632818606.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/7549324726.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zulum.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/30202369986.pdfIn PDF document text
    • https://bczenekar.hu/files/file/60298814252.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/40682618232.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/pisazifunodujuwuf.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/75778984454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+biology+of+belief+free+pdfPDF 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_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10460 bytes
SHA-256: 4047b75f9ee711f2b3550497ab69e3b066d950acf9e1e9bf97618833b06a8e8f
font_01_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 18628 bytes
SHA-256: 9c537f9e5f07e5c68aba6dde3ef8c5f2320add6694f20fa2586e700e10f8b134

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