Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbfdd8c862409f6…

MALICIOUS

PDF

72.3 KB Created: 2021-10-02 17:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05a3e554f39886094b012a7f7dec2cf0 SHA-1: c9adbf4078637445b5d45d1652e9951e00e29fa9 SHA-256: adbfdd8c862409f69b4fe626279cd1aca701a8edaa5e801d8bc167764030be18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=forex+tp+and+sl
    • http://vietsinphar.com/uploads/files/tafaxesegenujusor.pdf
    • http://fobas.cz/userfiles/file/71122205014.pdf
    • http://mdtrend.hu/files/file/70305859725.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/19396004565.pdf
    • http://nenkin-t.com/upload_img/ck/files/nazeki.pdf
    • http://sinproval.it/userfiles/files/8851416475.pdf
    • http://skomi.ru/img/files/file/31686853377.pdf
    • http://easy-sleep24.de/shop/images/editorfiles/file/37196432187.pdf
    • https://refakatci.net/userfiles/file/62578262721.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/78058763786.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/bibot.pdf
    • http://theheavent.com/userfiles/files/79098219177.pdf
    • http://kdsonline.org/userfiles/file/binov.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/8063089215.pdf
    • http://www.awakohchang.com/image/upload/File/agijuremiwikazonexagaz.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161377438edf2b---90403526688.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/mevikafelavobe.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/bomegibuvumutofugudetod.pdf
    • http://boxethai38.com/upload/file/47861830711.pdf
    • http://studioguidobarbieri.it/userfiles/files/36975489286.pdf
    • http://propack-th.com/image/upload/File/85674533852.pdf
    • http://smartdeal.pl/files/upload/files/31004435885.pdf
    • http://mylivediamondinventory.com/uploads/files/41352988970.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b497.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 16792 bytes
font_01_sfnt_off0000ccae.bin
81a706734437c0343b1ad19fbb88dcc6280e581f0216d4ebcef835c0daf97111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAE 10372 bytes
font_02_sfnt_off0000e441.bin
1bff33522999dc62a8c7c68986be9e42c9f4cf4775c76d62e7eabd38fb65e199		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 18260 bytes

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