Malicious PDF — malware analysis report

Static analysis result for SHA-256 46bcb4aa74a6aedc…

MALICIOUS

PDF

88.8 KB Created: 2021-09-10 03:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e53ad177cdddc88f41db8ec6506bcaa1 SHA-1: fe09101d465dc65c930484f7bdc9503c793b8696 SHA-256: 46bcb4aa74a6aedc55bb71c95a15f276293725cf7c62511f3518b4eda1ad11a3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=free+korean+vpn+ios
    • http://windmill-bv.com/userfiles/files/gilixujitijovomexenazi.pdf
    • https://035620126.tw/upload/greenkitchen/files/49804165107.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/91646098395.pdf
    • https://bimstudioinc.com/media/files/89630925425.pdf
    • http://minhquoc.vn/ckfinder/userfiles/files/40173339020.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/93341260084.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/zuvenobekaxililanutarebu.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae3f85d5f---jidisi.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/19262308081.pdf
    • http://mgrima.com/files/file/80562007220.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/lofefiwe.pdf
    • http://jiangsutravel.kr/userfiles/files/20210910_090526.pdf
    • http://www.sandipmallick.com/fckimages/file/pavofuwa.pdf
    • https://egf.tw/test2/images/file/xopotari.pdf
    • https://chuyennhakienvangvn.net/upload/files/38462836023.pdf
    • http://pharmorgsyn.com/upload/files/defevukiz.pdf
    • https://mytekas.com/UserFiles/file/waziralafotuvanikire.pdf
    • http://phutungvespaco.com/luutru/files/48924308564.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9e05dbef---87365561731.pdf
    • https://skykharchono.mn/editor/files/zirufizesuzo.pdf
    • https://insp.biz/img/file/sogogukolixinidamumiguw.pdf
    • http://idcla.net/upload/files/41093605016.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613117ab2d008---1337459052.pdf
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/26323805125.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_off0000f534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
font_01_sfnt_off00010d4b.bin
0a551ffa9d43dd12d3342b48e727b022fbb23026e42398cb0b5de72e932347b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10236 bytes
font_02_sfnt_off0001245f.bin
7905de546e66cfdd37ce36b19f77a9bd557999944b9f0e5c845335204c3bd3a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 18648 bytes

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