Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f11f2440b07495…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 13:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9dde242976df800a17e3d4e8a8098ec6 SHA-1: d5bd744e273cdb58b755b84adcebf44d11600acb SHA-256: 89f11f2440b0749582672c9b6c0859687b000fe4cd9e3e3601a8f5e3307d64b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning through a link farm. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://opremazabebe.me/userfiles/file/boxizudoxowoxibimid.pdf In PDF document text
    • http://anm-av.de/uploads/files/9576261310.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/23402293781.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/xupunot.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/toputolu.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109101859224873.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/69282911610.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/17869112423.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/bivosilobubeladibutovozaw.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161320fb10d059---71851012759.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/zekomo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/32693297312.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/27279144397.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/42605833914.pdfIn PDF document text
    • http://viorina-deko.com/images/file/zutuwazivu.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/9865287232.pdfIn PDF document text
    • https://thepainter.asia/upload/files/71453041218.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/22421855412.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401ae4f2127---26322228055.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/kuwemazatunozavamuva.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/kixomaxuwapironulamar.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210916044859.pdfIn PDF document text
    • http://yoron.net/up/files/53920735894.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/48626784768.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/womolonogexan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mega+mario+world+another+universe+rom+downloadPDF 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_off0000e074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 18492 bytes
SHA-256: 26770514ccef9998c223905e658695f15e52d65216824c9cf7d9060813f9da99
font_02_sfnt_off000128c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C9 10940 bytes
SHA-256: 5dbf3b36292920ebdfea15db5a3aeb0490a9615c9c27b3c4c55d35312c8a014e