Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be3db7aefc3bc7f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 19:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e6162bb67a3e2b6aac1aebc4ed101fa SHA-1: cbee4717c26c12c8d76f289aa7839c725b6f5516 SHA-256: 1be3db7aefc3bc7fd3dfcf532ad31feb0440a113c612cfb3835e4a414ddb03af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or are part of link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with a malicious document designed to lure users to external sites.

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 https://medvor.ru/uplcv?utm_term=search+engine+rank+tracker+free PDF link annotation
    • http://lg-palette.com/upload/files/vukobavepilupuxoxegelabu.pdfIn PDF document text
    • https://kermanrooz.com/img/files/rizelopoxoruvokobumitami.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/mopetefozevukudiziderazil.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/96877725894.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/90513890015.pdfIn PDF document text
    • https://turbooto.vn/upload/files/riraloxo.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/40820886211.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/57620411958.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/bopuli.pdfIn PDF document text
    • http://rotang.net/userfiles/file/56007741.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6d162b5e41b4b4b8ebcae935d38710c6/82807204585.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/golewegeb.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/rafudemo.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/48510394452.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/rarenolig.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/96332835703.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb869b773---93903306117.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/ronebepinolad.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/jegotinukitinedut.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/lavososamozakuzusow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50264e3d5---rixonediweruvi.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/62567820154.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/13289041912.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/gijomilovomijanewekunes.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/65851241678.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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 17616 bytes
SHA-256: 5b44be78919443c54139c28888ace692c9086f46fbfa90d32ac9451e7f46f967
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 10448 bytes
SHA-256: cf61bf28ae7bbeb6db985303996c45d397f39a9b63d7762821d40ed569f968da