Malicious PDF — malware analysis report

Static analysis result for SHA-256 b676644d26009674…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 11:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ae799b0287bffba5b9e36a20c0e1669 SHA-1: a03ff53bcf619bed20b3a2b5eccfccf63c2cfd2f SHA-256: b676644d260096746e78a627154dab43c2acf207cd9a4ac4c9955783822aeeae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ariaparvaz.com/basefile/ariaparvazcom/files/kipuvunudadudagufag.pdf In PDF document text
    • http://www.uc-kushiro.net/images/library/File/79991145684.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/75285676120.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/34616855508.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/11867845151.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/garafasedokoter.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/nurixigevivaler.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e1bea53f09a744e0316f6041f25a240a/33555359236.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/65483073931.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/bezizimewisuge.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e244612ee1dd7c868c5c45d3373ccf76/buxekamerumureg.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/lazelaxatuwasu.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gotozabelewazida.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/pizilukaludefesejir.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/600390561.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/93517848186.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/26541310939.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/19664396578.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/nesapujugezagiz.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/57971999997.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/zujowixidogedikiwej.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/xisulibetatudenos.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/rawesamikufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+10+beauty+actress+in+hollywoodPDF 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_off0000b104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 11188 bytes
SHA-256: 13dfd9bac01c25ebdfa577d642e3bc642571dfb3866cb12ac5a84ef85e767158
font_01_sfnt_off0000cafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 15140 bytes
SHA-256: ce7c5f620aa40d4d28f4e78f9887854ef08479675f5b67141ee2163d4667a352