Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54a40e2bd940f6a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 02:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c335d86216be38df2d7dceef3f0733ea SHA-1: bbb6e7509d43e3a51e97f5ca01e7be482eb22e56 SHA-256: e54a40e2bd940f6a8e6df927f7780e5bf839e50fa335eb44b4f0683cbe16c3ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://nls.vn/upload/files/pugenavalabagu.pdf In PDF document text
    • https://linhquan-group.com/upload/ck/files/26639866708.pdfIn PDF document text
    • https://togeltop.net/contents/files/17999629733.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/75793842462.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/tapuzivujile.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/kosovaninoxesegasi.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/5233911925.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/41087623269.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sosoxowitozozoxumaxizudim.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/97312326662.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/vutitasipamez.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/wawapo.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/62923332737.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446aa3716f3---lapilibirajekagotasiru.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/1721760708.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/43919310193.pdfIn PDF document text
    • https://wrd13.com/force/file/jever.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/vulas.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/givumidede.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/debifomawujulexusawadobo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/xajisovuw.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/vupijigurezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=marble+blast+cool+math+gamesPDF link annotation
    • 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_off0000bd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 16572 bytes
SHA-256: 689d2780a73182e32290e34ee0a67022644e12537f4b82e7eeb50c8b6aaca591
font_02_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 10612 bytes
SHA-256: f28221f9ce3bc628cc18615cf5682e32aa91940a00fb207066e6de49fc4ac1f0

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