Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b24dde91b3959a…

MALICIOUS

PDF

90.7 KB Created: 2021-10-07 14:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82dca898dede48e8ba6893dd313bbab7 SHA-1: b77404ac98ce26f9bbf439b84a96b21a854385cc SHA-256: 27b24dde91b3959affc22fe50789906b35c30586a5a4c010ee526d571f6d0939
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm designed to distribute malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://keralabiblesociety.com/fck_uploads/file/308023348.pdf
    • http://ominocoibaffi.it/userfiles/files/vepiwufojibozowokibe.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/29059521148.pdf
    • http://cec-intl.ru/app/webroot/files/file/powivodaralidupuro.pdf
    • https://inijariku.com/ckfinder/userfiles/files/43709909767.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8bf50339d8da3995819e80b442a788f6/mewafa.pdf
    • http://funkyspa.net/ckfinder/userfiles/files/bajetes.pdf
    • http://www.jasolasia.com/image/upload/File/jakufa.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/51845159512.pdf
    • https://sadhankendra.org/erc/media/6937529881.pdf
    • http://locthanhwindow.com/img_duhoc/files/21653160821.pdf
    • http://dopuskvsro.ru/UserFiles/fameninasizap.pdf
    • http://mybed.tw/uploads/files/202110061255102505.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8f1e4f94a---97363053722.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210906021334.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/dutad.pdf
    • https://suativisamsungtaihanoi.net/upload/files/sazemepodazolajazu.pdf
    • http://dailitara.lt/bites/uploads/file/voguponifelosarivu.pdf
    • http://spellenindex.nl/images/uploads/78554598342.pdf
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wenowavadubasidoga.pdf
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/95654013489.pdf
    • https://neksav.com/upload/ckfinder/files/gusanapumil.pdf
    • http://marienoellebermond.com/img/uploaded/file/sowimejesagaserowixotu.pdf
    • http://suurelepa.ee/data/file/85731487274.pdf
    • https://www.ruchya.com.tw/upload/files/37495339319.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fasting+23+hours+a+day
    • 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_off0000fd29.bin
e8219d3d7c0ed426970fb620ec3dc6757217a6ae5aa38f445421708e332a650a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 10832 bytes
font_01_sfnt_off000115fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 16792 bytes
font_02_sfnt_off00012e10.bin
f101f567d9c89f8cd01bac201261fa58487e30addbad30411b201eeeeeb833d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 18256 bytes

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