Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6026e64836cfb36…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 12:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cb46bc8ca3d2d2fa5e6dc9c41f8d761 SHA-1: 8745374360c0deb7248af5f1d11f4a6da3885437 SHA-256: d6026e64836cfb36210c33190ee386b516e1f088c59e6237bff955ddd8df8578
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to potentially disposable domains, suggesting an attempt to obscure the true malicious destination or to maximize reach for phishing lures. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.studioline.ie/ckfinder/userfiles/files/22906433018.pdf In PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/51284853667.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/gimotogovupijixelo.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/20186204902.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/88964404239.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fukoviwiwudosusamomosomam.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/titanu.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/37928071751.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/28663812022.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424ba4c09e2---96727556347.pdfIn PDF document text
    • http://sjanzee.nl/file/toguzazumikagobamuxit.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/wipevafowodowifasosusoge.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/92115341983.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gefojama.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e38ae8fa---78098074262.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/naberuvupom.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/jazubolapofoxevesumoz.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/jadoxinopezogovi.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/82809665258.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rogoxejow.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/83797653092.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/sepaneru.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210923_062041.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/14758998755.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/zajosezajapa.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/914907555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+app+download+2014PDF 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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 10712 bytes
SHA-256: de203decca93fdcb4da068214deb752a254d2d504faa52de14a3fb387ee70213
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 18320 bytes
SHA-256: 1e61295d6c9e325b64a5a42d0defd9081513106008509d2feef2a13fd82c7185