Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabcdd01a20e0795…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 12:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bba28009ca810b63dc2e17c43df0c92 SHA-1: cb8e86401bc153e08779cb7dd44641d2b85b3c90 SHA-256: aabcdd01a20e07956c339e3e5bc9de47836ad357eac5f2f6e2e1f71085345bd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://cesishotel.lv/res/wysiwyg/file/72516531718.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2839b43b---18549377013.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/duxerozinebowomujevo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/modojivadavimezenumum.pdfIn PDF document text
    • https://businesslife.com/content/file/91873629656.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/37211936188.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/76287379673.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/jibiralafozux.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/57049029475.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wakeperemafepuregexam.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109231702211568.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/87472666176.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/79859434526.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/97110657878.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/90789670433.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/wekapoxivemide.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328dbc574ae---wujovixowolura.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/67838965571.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/43733796170.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/71901503550.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/82065601702.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/6315868837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+free+wallet+app+for+androidPDF 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_off0000ac58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC58 15080 bytes
SHA-256: 865554ee00df9c1e51f66228ba6bc42a0564235424e8f0641f0486bc01363b04
font_01_sfnt_off0000d1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F9 10632 bytes
SHA-256: 6ade3db4ad318f5a868fa1929f7688e4b2a4291e3d502baa9d9d00e5bf6352aa
font_02_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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