Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7de0d9983589f2a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 05:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9cf7bbcc2562a6e566282df84ffb310 SHA-1: c1a5faa157753c4c684b55a501126ed03c9d55dd SHA-256: e7de0d9983589f2ab3527857e4c223f21f97b50cfbd64f90cfb8c05b9c5b8a92
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 4

  • 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 https://inwebjor.ru/uplcv?utm_term=zombieland+full+movie+unblocked PDF link annotation
    • http://domoticasociale.it/immaginiNewsletter/file/bawadulosegizabiluzivud.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/dikusafixinelemodolesuva.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gipedipuwarevu.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jepifikijazaxuwutogato.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/93728612368.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/28429706392.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/5419933565.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/zegopinuwajakujuwaxas.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/duxumavon.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zaxolivisutimepa.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/senegoja.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/93005594704.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0a0a6ddec11d5d33c36ce414713ac707/lovixebiwaset.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sikiwitusubules.pdfIn PDF document text
    • http://zuche0551.com/upload/file/miziwekidagixewimuf.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/691051201.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/fosavezatodorekuzigare.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/pikomaxa.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/8335787853.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55874592162.pdfIn PDF document text
    • https://atiksigorta.com/files/tumotuwozofisodalokebo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee00fe2388---20452901963.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/31247187573.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/9210937111.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/75081280802.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/wolaxuxojusidukuja.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_off0000c640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC640 17452 bytes
SHA-256: 2206227fa6f1bbf5d29e97b72f57e53844ba4ba3eaaee33b012e0d030e0ec30f
font_01_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB7 10632 bytes
SHA-256: d899460b70b806d7a4ad8903752c69dd60a08fb4042f4f5e5670b01f992f3c4e