Malicious PDF — malware analysis report

Static analysis result for SHA-256 53832111c894657d…

MALICIOUS

PDF

85.0 KB Created: 2021-10-08 18:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2126737426945cbd9a92c1ac8aa2e552 SHA-1: 5c2c153f2ffbb8b1cecc1c6ed5670677f5b52c7b SHA-256: 53832111c894657d50f3f93db10dc412b752bda6b334ae30f616b8b6e12641d4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cosonnguyenthanh.vn/webroot/userfiles/files/sidowazimebexixi.pdf In PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/47295690220.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/97251195707.pdfIn PDF document text
    • http://markone-tools.com/upload/files/nisapixuwobifenonaxonuve.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/54416056194.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/vanowepokizifukigejabemi.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/gajagu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/59917428891.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/1024234339.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109270327166731.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/rotimelovu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e734395ba8f28141daf19f5f5b033bff/sebuzulas.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/nanebeguxax.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d472400dda49ee96ec3164146215276a/15870528654.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/janowizaforij.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/7535083250.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/95966164079.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-21/images/files/dafalafabebel.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/lotumililumekije.pdfIn PDF document text
    • http://pololanna.com/user_img/files/52156111784.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20211005_003052.pdfIn PDF document text
    • http://cudicio.it/images/file/jofub.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wewukesofikexoribe.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/vamuvigowatijelepa.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/nuzeluzosemulomorari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+most+basic+unit+of+lifePDF 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_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 10732 bytes
SHA-256: daac6708359797f8b24e7d46ae127d95f9d6b9cdc80f8750f507bdb7c568aee8
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 20516 bytes
SHA-256: 80d418b497c585fcf6befb652796122d587dced5376c2d3e53e5b6cf87b37132
font_02_sfnt_off00012e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1