Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afecc17295ab858…

MALICIOUS

PDF

73.9 KB Created: 2021-09-15 14:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7fd002d0b4a668821e7fc065e351572 SHA-1: b6b3a396ad0d42af92a37f39fb0f9b1135206662 SHA-256: 7afecc17295ab858a66c3184a199eed5e773592d3d46dcdb92169ea611feb04f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or scam operation. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

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 http://cupta.org/userfiles/files/20210904083235.pdf In PDF document text
    • http://ehomerealestate.org/images/file/rixunepi.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/wesamajelesogazidojepa.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/9320040046.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/59959261247.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/41954357071.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/39463913170.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/ropudekizidilakeposi.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fuwobujiz.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/tivagepepamemakizedefutov.pdfIn PDF document text
    • https://phukienbep.net/media/files/dupekobasisadubuvevamewe.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/kawodowawuki.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/74603971889.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/52759491986.pdfIn PDF document text
    • http://reflita.lt/uploads/files/witep.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/lizuneg.pdfIn PDF document text
    • http://aa-nusd.jp/7687124226.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/lejefimen.pdfIn PDF document text
    • http://rooptex.com/uploads/12746247307.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/lufififumanumubom.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/49844199531.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613990e1638cb---levori.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/sixotizafinukixakifes.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/89901260055.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9988c5d8cedcb460e29e3c1daa2a8640/30464392390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+check+a+phone+is+hacked+or+notPDF 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_off0000c216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 15304 bytes
SHA-256: d1da63bbe5829d2b288a3a463feaf916710743b2fdb57892ea3a4dd869d0bb67
font_02_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 10732 bytes
SHA-256: 8b7a762297245a7061a0ccdcdac80c77f6cd261287c571b312c298f4a2bf2f72