Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1b734de4a27495…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 23:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a23cff82bf4f0c51764ed290e76d606 SHA-1: de63401b3fbbff6736c68300b3dfb1e94437548c SHA-256: 4e1b734de4a274954b4a43581e47b98099bdc53a28e0c8d93fe35c8f03dbec0b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including one pointing to a potential download lure, suggests the document is designed to trick users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=fortnite+download+not+compatible PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/lekulizenolaxejelexe.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/68507021113.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/40268522673.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tubovakunizesape.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/nigon.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lexasosof.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/30386247844.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161325d24c929b---gulofevikeg.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/mewugebijewutegofufu.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/biralujegapopigelot.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/20661622204.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/kevejavumifi.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/nejawovu.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/20892208501.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/feliroxenaf.pdfIn PDF document text
    • http://safetruck.gr/images/file/82583448385.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/kisaduvajunivozolugewox.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/26860452870.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/jedibabe.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/15815762583.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2tdd0akuktlfsl6h581cijbujn/18834817962.pdfIn PDF document text
    • https://kaimano.it/file/89443791144.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/merubupuwagosonig.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/66561765594.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/suximiwel.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/ralezafoj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 10708 bytes
SHA-256: 1f346d1b78bc098f047430162c83f2282e320b6c8984fb25c8251f3e02baf95a
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 17540 bytes
SHA-256: 168281d13c2821bc03fe1c05f355d5e07b5dee926186308c194cdacb277e8389
font_02_sfnt_off0001206d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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