Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28943ebee63687e…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 10:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0370f66fcfcf9cb5db9d2c01ef138737 SHA-1: 89df8c66a6c2729932863ac2f5f6be457ee93406 SHA-256: c28943ebee63687e1b84b7ce568a3011da81179ca9876dd40514a7678050cf99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://jinanxintiandi.com/userfiles/files/xuzudilugosepajupisit.pdf In PDF document text
    • http://krukaiart.com/userfiles/files/wizeliziguzaxuxeguwibib.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/49076795241.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/65510597407.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/kigitilikedoresus.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/70915466351.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/58242265306.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/53233104821.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/69618313407.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/likirekusarevare.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/74150938297.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jepove.pdfIn PDF document text
    • http://tianfonmm.com/d/files/bijivupifuwi.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tolekipivameju.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/47966442960.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/suxutejel.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/kofumugu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/50115797418.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/bodesotapadapenupuwim.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/wekaxep.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136019831f1d---55871875974.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/35004278870.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zopipejozimebapuniz.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/90439593643.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/19013518464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sky+cloud+app+for+androidPDF 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_off0000f1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 17176 bytes
SHA-256: 543ede2573025222c09e101ed9fff26e2cb05ec6885a325c45fec21482c65193
font_02_sfnt_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 10596 bytes
SHA-256: 04d767ba796859016e2d3746fd43c265284eac895d3a28184776064548ce67d0

Open this report in the interactive analyzer, or submit your own file for analysis.