Malicious PDF — malware analysis report

Static analysis result for SHA-256 34051f7bb23a9b5d…

MALICIOUS

PDF

81.3 KB Created: 2021-10-05 09:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3cef1bc330ee0eaf304b2e1354b07c78 SHA-1: 04ca8efdfb7034d306a5c66d8a64997ac8e77dcc SHA-256: 34051f7bb23a9b5d554123207eb0bb5a1b38f39b6cdbc85693afd592b8cc292e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings, particularly the ML classifier and ClamAV detection, strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5ae835a42---67480419770.pdf In PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/20544603468.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/14717011862.pdfIn PDF document text
    • http://firegallery.ru/img/upload/pinepomapubapozezafije.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/85070012032.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jaruzofiguzerigudapum.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/92628849075.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/75749909011.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wovunik.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/82123484744.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/87825671652.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/47088436939.pdfIn PDF document text
    • http://krokodilok.hu/_user/file/voxuponuzopeketat.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/nezemojegizi.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/96662682898.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/xotenajedorogilonagiduto.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/nuvemezaruxorovuwatafosi.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/kofakam.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/16301024621.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/47995381682.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/kafujiji.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/79668457159.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a26d1cc8b9e35ea74e771f279c06b471/18869029624.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-21/20210921055910239808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=red+belly+finchPDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10224 bytes
SHA-256: 7be96b17092c98725e6fd40f277c7432832c56326fbf3cdf91f396ddae95aa7f
font_01_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 19020 bytes
SHA-256: 07bad4826f2add68a5519a7d20847e56ccdb9984cbf3c562e508d0d6de2fe060
font_02_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1