Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3b5dbcd7db76d7…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 02:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e785bcf57ceea65d3bb2092a34648599 SHA-1: c8b6614ae7e0fa1e4681ec67cf3f3bceeac39f28 SHA-256: 4c3b5dbcd7db76d745a920dd02ccaf4185cf9bc200421b1e8c954239c95b5e26
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=android+kunjappan+malayalam+full+movie+watch+online
    • http://misr-consult.com/userfiles/file/20590662410.pdf
    • https://facades-et-traditions.com/actualites/file/48180158401.pdf
    • http://change4best.ru/upload/file/42389687836.pdf
    • http://plise.org/userfiles/file/22789549531.pdf
    • http://materialdeestudo.top/userfiles/files/kozowofedav.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2630a1451---63410729846.pdf
    • https://taiwan-tiaya.com/upload/tiaya_official/files/95570238130.pdf
    • http://pantryscan.com/123cars/imagefck/file/rawawemaxagiweso.pdf
    • http://gyn-ordi.at/myPix/file/vogafaximuvadogarasavawuv.pdf
    • http://rbtyutj01.com/userfiles/files/lofokilixizunasutasedanez.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/7017140512.pdf
    • https://foundryindia.org/userfiles/file/65720612413.pdf
    • http://aaz.sk/editor_uploads/files/18667876322.pdf
    • https://o-dance.com/upload/files/74079318999.pdf
    • http://monteconsultants.com/image/upload/File/54505272671.pdf
    • http://noithatmyhome.com/img/files/puporotifekexulor.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xopezoge.pdf
    • http://muabannhagiare.net/images/uploads/files/zejoru.pdf
    • http://koreaseowon.com/ckupload/files/tusibagigujedazuvifuposo.pdf
    • https://mycocoa.org/images/upload/files/nasowijibolof.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/wovizerowabux.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/39695546695.pdf
    • http://euskararenginkana.eus/files/galeria/files/67740176678.pdf
    • http://engcaphone.com/_UploadFile/Images/file/bisomarawalumosolu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6d24849b---96558900042.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_off0000e881.bin
6ecee1139fdfb6901ad0dbb0fcb0711b3359c76fd7f3aba0bcbd2429aa66db51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 11284 bytes
font_01_sfnt_off000102da.bin
09e28a7409f2a4ce61485a9a87be7692c343d4504c7b89ee6089faf0013167d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 18240 bytes
font_02_sfnt_off0001322e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 16792 bytes

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