Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f38d52eeb9e9eae…

MALICIOUS

PDF

80.5 KB Created: 2021-09-19 10:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c055be063564bd0882a0cdf87420adc1 SHA-1: 2fb559f8e3a56e163716c5f09190dad63cbadc56 SHA-256: 5f38d52eeb9e9eae70c08a77e951df383282f172b365e7e5be1ac1e2f118c230
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://albertopizzetti.it/userfiles/files/23531815618.pdf In PDF document text
    • https://cuacuonbentre.com/upload/files/5924505981.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/74306352481.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/65707069862.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210912040320.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021915170521925.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/66373540812.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/9757823496.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/puronoj.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143ae388954d---53082909451.pdfIn PDF document text
    • http://klaaswester.nl/img/file/52169620369.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/18521009707.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/pozojujamexukoxafavupidu.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/jijerivugogukurixuwivigez.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/58756558169.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e0dee4e1bbeb5b3db9a5ab8d79b063a0/vikipojuva.pdfIn PDF document text
    • https://poker-fire.de/file/46454204332.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/75617419851.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/22171566563.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/jidewusisogobikuxi.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/36631148628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=operation+mekong+watch+onlinePDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 17764 bytes
SHA-256: f3627c1d2f6d43cc11dcbbda5f546d16f363a177dafa950246d10827110a234d
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 10856 bytes
SHA-256: 1645b6f14adb0591af95bdd3e1e6bb5002aaa515b8caa4604051e67613155e2e
font_02_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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