Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2d54a185558490…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 12:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4ad91342548e5b173762d9591dd56f0a SHA-1: 6745dfd2cc836018734002a0d6321b71a378b70e SHA-256: ae2d54a185558490d03f471e506c4ec3fc7e6d2ccd9afbce7f6601c7f63cb0e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=although+at+the+start+of+a+sentence PDF link annotation
    • https://otterdisplay.com/userfiles/file/zazowarijeg.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/82072948791.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109120831286604.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/sowosetinijuvi.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/xowejupubolef.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/wamepoxexabad.pdfIn PDF document text
    • http://premo.at/userfiles/file/54188272138.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/83827716577.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/58468942963.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/52760570743.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/57860072726.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/penanodafe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q54slmune4m8k7abb5052btn2n/puburigasudowog.pdfIn PDF document text
    • http://airfa.it/userfiles/file/75568082406.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/15482891158.pdfIn PDF document text
    • http://www.pvvc.cz/files/79456789078.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/dosepebifipa.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/o0drr0hjkg5vhq7jvq70kufipb/jokanatinob.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/67803879311.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/661162447613fb362dd483.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vekamijexizasi.pdfIn PDF document text
    • http://panteres.com/files/files/legub.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/gepolopovo.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/mobuvovepezixi.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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 17784 bytes
SHA-256: 9ad07f8424267105d1abd390dd48bf50a15efce662e5cd8ba6f9f507f03ffcb2
font_01_sfnt_off00010656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10656 10604 bytes
SHA-256: d28035f5ae3705e54e3862ffb4207dcf9ccaaefe8157feb37a8bb528d2dd1200
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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