Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae495afbfafafcda…

MALICIOUS

PDF

77.9 KB Created: 2021-09-12 11:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3007d0d8dcaed6b14d844262f120beac SHA-1: 20ec2eae42601aa9ef5bd8f30853d67bfb27bd8c SHA-256: ae495afbfafafcdae85c3bbfb1e6341c178e53b7b5a3a587e90653858c7f1658
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=think+like+a+monk+ebook+free+download+pdf PDF link annotation
    • http://reklamaopole.pl/userfiles/file/gugugoda.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/merubupuwagosonig.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/nuded.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3bcb0ebe9e37d5fbcfd31baad637a4c/tekojusozes.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zawurorufutuxuf.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/lurew.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/xodape.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/49870368402.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/gusojezagazonebujowosazo.pdfIn PDF document text
    • http://abwrva.com/uploads/files/jujaguzigofivetelisexa.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jutunan.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/baruvikupip.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137757e36aaa---14863919730.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/28574435265.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/webisuxa.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/baxukexifik.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fatimokugomugakegivi.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/31457471023.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/latovam.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/miraxekal.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/jejikananulesamitiwe.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/senerulerejapuribomaruf.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/kigevufojezinixoput.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://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_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10780 bytes
SHA-256: b928744d517bf77d2e99de9e220c0c8598644a067b6be5d7d7be7a6e2a95b9f8
font_02_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 17756 bytes
SHA-256: 0f430ac40787289a81d696c5bfa58fe8749c0495e982bf7f34e2a6082fd4b971