Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cde083a2404cac7…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 08:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93b064daafcbca7cc9299444080a332b SHA-1: 5a4bee5441284e3344fff74e0c41e62cad005766 SHA-256: 1cde083a2404cac7cb26fcb19480689663a7244f1a3e7694eeccd0be6a77f4bd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a PDF containing embedded JavaScript and acting as a link farm. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic strongly suggests the document's content is designed for advance-fee fraud, likely by impersonating a lottery or parcel delivery notification. The embedded JavaScript, while not directly analyzed for specific actions, is a common component in malicious PDFs for executing further stages or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.peritaonline.es/ckfinder/userfiles/files/futozakutu.pdf
    • http://esebtekstil.com/resimler/files/11208942964.pdf
    • http://officeharbor.com/pdtInfo/72271994746.pdf
    • https://npkfertilizerproduction.com/d/files/51209026269.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6b8d14b3---xaxigenutavokagiloxirijow.pdf
    • http://polesprogettazioni.com/userfiles/files/98665274053.pdf
    • http://ketphatthinh.vn/upload/files/9749937210.pdf
    • http://kledingindex.nl/images/uploads/leloxudogisuxutipo.pdf
    • http://sjar-tech.com/uploadfile/file///2021090823163143.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7067ea7f---mitaxujanigapikipixave.pdf
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/xovuwukofudi.pdf
    • http://falerisztika.hu/tmp/26099914555.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/46408047622.pdf
    • https://shindah.com/images/ckeditor_img/files/fagogixuxiguvotasifusub.pdf
    • http://juentai.com/userfiles/files/33247751253.pdf
    • http://mistral-paints.cz/userfiles/files/41363047031.pdf
    • http://cpils.com/userfiles/file/zodide.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/61972522006.pdf
    • http://cuacuonnhanh.vn/Images_upload/files/bibodubijemonozo.pdf
    • http://anchor-m.com/js/upload/files/96204394738.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/bimuduw.pdf
    • http://sbcnepal.com/images/file/43072806255.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+all+data+from+android+phone+before+selling
    • 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_off0000e772.bin
f43bee7f53d8fad19ff956360eddec50faa962b88207aa3b99e65a7d94f74ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 11228 bytes
font_01_sfnt_off0001011d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1011D 16792 bytes
font_02_sfnt_off0001192f.bin
4e326c40712ca69419d014eb9feaafd95ce4508c9136fcfac455270ffff17f2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 17620 bytes

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