Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9a7eb897c368cb…

MALICIOUS

PDF

76.0 KB Created: 2021-09-18 12:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0c0ed38356b8d7aa4bde4938f7c164b SHA-1: 04c855e8220974b1986aa5efd87e8547a020e35a SHA-256: 6b9a7eb897c368cb37a60b214e1bbd672731f7ec7a3ea4b9c5175cc0ce56b674
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to a link farm, a common technique for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a structure designed to obscure the final destination, likely leading to a malicious site. No scripts were extracted, but the overall structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://interativacorretora.com/fotosempresa/files/16800423213.pdf In PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/61315092878.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/fodiwifisusubavujo.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/96755142848.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7ade939e8ea811f1ad64908ebb055fd/lomupesutokepizuvigedelow.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/pofudoxiwu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/37998950032.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/93941163137.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/mubuk.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/duvuvexomulino.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/42371655037.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/60566854122.pdfIn PDF document text
    • http://tai-group.com/upload/files/78380240650.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/96387578198.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/zarutulogekenu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/30055337766.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1585df4d3952b72a808d9aea1ff63a86/1967914091.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/58229447444.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/98098879394.pdfIn PDF document text
    • http://oilspecchem.com/files/pupiwawemomukisomuginudum.pdfIn PDF document text
    • https://koratspring.com/upload/file/46447111425.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/21057727296.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/bisosifemagugavidan.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/40476136680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=trigg+beach+surf+camPDF 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_off0000c40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40A 10616 bytes
SHA-256: f39d73ef72e74c5b1654a1583ebce8abca3487c964b3d28b462aa702a217def6
font_01_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 17724 bytes
SHA-256: 11042ba6d2ae6f7eaa1f4c7202647f8c7280160d323558c39f1f9bb1fc1ce4f2
font_02_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1