Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b05136934818f32…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 06:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b9af7c8d0019964421b116ccc4e7e742 SHA-1: 8ede996ed963ab5b4e6cd00c9cbd809c59a10177 SHA-256: 0b05136934818f32ae00c927b9d19de1b6206ca0e9f6fadf4b5e69cdc4cd3466
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest the JavaScript likely redirects to a network of phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://celcg.pl/uploaded/file/80532438967.pdf In PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/7180132125.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16609535221.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/varato.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/38718251013.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/nefaruduniwexodanepano.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/wopovadotofatigadaneb.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tafofazinubutezipazud.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/29368612550.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/jolusinivifotisazodoke.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/31418341758.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109271455487041.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/26991006341.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/24238800687.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/86173505549.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mokem.pdfIn PDF document text
    • http://ombs.ru/uploads/files/82620496164.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/91192279920.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/nagutovawilunagatuwizerot.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/13015841494.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b8f84871---67429072411.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/27c83c32e1efd58b5aaa7bcf15e9c25d/61040003094.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/nizukowiresogivap.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/45720699206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+transfer+contact+from+android+to+iphone+11PDF 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_off0000afc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC8 10968 bytes
SHA-256: 1de0a0e1c946dba3861720353e1d0a70236f5979f1b652e0d97261b3d0a65a20
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 15912 bytes
SHA-256: 13f809c7e0b43a072aa1b3f8217bb7c9b6d648d67a23fb4ba2ceafe110d76702

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