Malicious PDF — malware analysis report

Static analysis result for SHA-256 0666743e59f27090…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 08:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30b2ce5ac0e3edf7c9edd9ae2376f428 SHA-1: e862b9ab7df28c14231b05c10bbe9b59896c02f5 SHA-256: 0666743e59f2709063f9949f3ecb3826acfcbe467a6f11987da37b3fb553fd49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://bdn10.cz/files/file/87008427513.pdf In PDF document text
    • https://abouelhoulgroup.com/userfiles/files/pakelamupasirivivino.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/miramalifodevukuzavuriro.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/bebobavozoxuvo.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pixitaniwiridikarovamig.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/13175248572.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/batijuj.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/wefavalukukunezexe.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/lefubowaguxogeta.pdfIn PDF document text
    • http://rnralpha.cz/res/file/28214119278.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/52629649370.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/14640169720.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191305044.pdfIn PDF document text
    • http://manu-transport.com/documents/file/13167770211.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/71183831833.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161363824ba42c---vukodofirogatovoxabivoje.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teroborevebidupumogimoda.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210906_094237.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/52803731874.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/19382395666.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/damidoxegemibegobupum.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161318660abd0d---39745004207.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/tuvotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=11+basic+guitar+chordsPDF 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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 10560 bytes
SHA-256: 0c824f49b5d1d21a97743018b667abf9dfc9f77af49a602b708e9d4b317b73d4
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 17400 bytes
SHA-256: e64192cdb7524b139e15a0ab529b6e3e7aa984de3bf946668f1db9b95123ad1b
font_02_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1