Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aba9fc3e1ad37e8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 10:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: caa082d337b829d86ec5b5d47d9b813a SHA-1: a810758a13dec9586816c0ebc8224a244402e2ef SHA-256: 5aba9fc3e1ad37e80110ceefc3a8ddfa75af944d2b84c40c95f16ae495c1586d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hanasushi6.com/uploads/files/22067862552.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/gebuwukurezutiv.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/98064069345.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/rajakagakip.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/326323391.pdfIn PDF document text
    • https://alariel.be/userfiles/file/94075728469.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/bfb6abcefeadab94c97fb254e6849d03/sofufoxar.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/tepofasatidumeluxudubo.pdfIn PDF document text
    • http://edallyshop.com/upload/files/popovozexavulorevepijula.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/54032044868.pdfIn PDF document text
    • http://ministerium.pt/files/kurivowavux.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/64391809152.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/23231847469.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/pofogej.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/sadalumewapegitadojavosus.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gakuzakedexokirawegokudul.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/deretizab.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/38068873110.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/92483934558.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/giwuragige.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210915190953.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tekopimavoxabumofel.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161408ce516ab2---vuwobovomoru.pdfIn PDF document text
    • http://hkalc.com/userfiles/60987897913.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/4673392721.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/kalaseraxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=phishing+app+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_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 10396 bytes
SHA-256: be3eedb862e684bb7d4b1d3532134b2da885bd699573b97ab7a74e721407e406
font_01_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 17624 bytes
SHA-256: d2272ac4ce6b0e59d3562550fe079b65ca232c7f988612bd259496f2e1d1e800
font_02_sfnt_off0001395d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1