Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d4884eee0d7fa7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 04:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 453820fc902dd50f788cc1100621a54f SHA-1: 97281bcf9884c4735f598fce5c896af860f3d5fa SHA-256: 37d4884eee0d7fa7f760f1c6a6989995924519fe47e758b6ac7170eab29e04e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous unknown URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ipsaix.com/ckeditor/ckfinder/userfiles/files/24636687778.pdf In PDF document text
    • https://sklepbonus.eu/userfiles/file/nawepatisu.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/12389808353.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/rifopiguluzujuredikiz.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/pibebidowifabagalikofoten.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/49975917414.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/lazuvumubopewit.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109020559533803.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/vexikomepunipurijazo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/selidunemufejanaxaduvi.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/99523603403.pdfIn PDF document text
    • http://klenderbio.com/upload/files/wajerutula.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/71748323801.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9e21debe38c22cc0c52ba2930cef529a/zolakudatinabiximiwaki.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/kalopedolapokekol.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/52639668000.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/93707474708.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/jenarigogena.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/tezigabivojubavunokudi.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/bizozeredowulizikesa.pdfIn PDF document text
    • http://uco-kampen.com/media/files/74691902265.pdfIn PDF document text
    • http://bankerz.in/qpic/files/36100335320.pdfIn PDF document text
    • http://beta-rc.com/upload/files/53129887211.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613914bbd02ab---zojok.pdfIn PDF document text
    • https://maymac.info/userfiles/file/sewomuzimusisuribonaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+share+screen+to+another+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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 10404 bytes
SHA-256: 536851b679f0952e482db52e35a2c73f5948a7dbc09f2530c62d042122fa94ed
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 18120 bytes
SHA-256: 674a15e486131e769e5c4e38994f268ba4e2ad73df20cdc61da4c3abc9b3dfca
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1