Malicious PDF — malware analysis report

Static analysis result for SHA-256 8421e12d3462cc38…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 21:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eddaece666d4619a37b6e4d245210057 SHA-1: f523e87273d4042516562861974ce84150430122 SHA-256: 8421e12d3462cc38596051d17708fb8f4f9434b890d71002f048051c99ca792d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and is identified as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure and external links are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=persona+4+golden+margaret+social+link+guide
    • http://journalofcritique.com/ckdosyalari/upload/files/7261250046.pdf
    • http://kotolantopeni.cz/file/jivale.pdf
    • http://dlzhrjd.com/images/uploadfile/files/peduke.pdf
    • http://yugang360.com/upload_fck/file/2021-9-9/20210909143835337019.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/zanekukinije.pdf
    • http://massageindex.nl/images/uploads/vavuginapoloduti.pdf
    • http://awfiowv.love-mrt.com/upload/files/mupizilipixufobepopa.pdf
    • http://powerfalcon.net/uppic/files/sagasiwugofonojeleliliwun.pdf
    • http://chamdure.com/DATA/files/dowarejuzajumiz.pdf
    • http://tochalco.com/uploads/files/niwufabimotuxi.pdf
    • https://clove7.com/userfiles/file/fifirelelurenilajegasute.pdf
    • http://mirai-kankyo.com/userfiles/files/guravavovodaziv.pdf
    • http://apvn.info/userfiles/file/tigemur.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/96632750749.pdf
    • https://ayurmitra.com/files/file/32064765086.pdf
    • http://fw-simple.com/uploads/files/4762758437.pdf
    • http://decentlogistics.pk/survey/userfiles/files/15579577357.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/30335027905.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614efa464e910---gibukifuwojogebunulefib.pdf
    • http://gruppocinofilomarsalese.com/userfiles/files/pajolebumenigu.pdf
    • http://planet-for-events.de/userfiles/file/38231088023.pdf
    • http://cl-pub.com/files/files/xifitudo.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/32420488623.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7220e47f---jujumonofatusepebiruv.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_off0000b04d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 16792 bytes
font_01_sfnt_off0000c864.bin
85d021539f1a062ed9765b12f24de83716fe79dbccfd36f46f0a61de7703b6e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 10984 bytes
font_02_sfnt_off0000e1c0.bin
7413e099c241d4117e5e8f28bbaff47e2a278332881dc11a87a6c4d67a801844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 17584 bytes

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