Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bcb96ec19a1093…

MALICIOUS

PDF

74.2 KB Created: 2021-10-23 11:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 672d514aad9f5df27e76d61c68d52887 SHA-1: 6e5ae1ed9452ee19f843711360e193b990832b1b SHA-256: a0bcb96ec19a109396e39cdf97ca9c51713cc8a52e9afd1f102dfc9bc2f89d67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple external URLs, one of which is associated with a disposable hosting heuristic. This suggests the PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mitrasuksesku.com/userfiles/file/rasilewevi.pdf In PDF document text
    • https://emenu.hu/editor_up/2341925875.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/56580088763.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/mewewu.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///9247559236.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/70653436121.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/runakarepogoposafesego.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/gupape.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/50841627760.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/24062156464.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/rodubagalelimodonefoxemem.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/99080186567.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/58265488110.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/93042915812.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///91412683413.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/99566974996.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16152d8482ddf1---57330694389.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/wajadivusokilugewor.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/4100885975.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/xegomatuwaliba.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/95659958540.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/julugobewor.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/fesaten.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631829290.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=stages+of+erythropoiesis+pdfPDF 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_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10816 bytes
SHA-256: bb9a10be80f5f48db1d37e52c8bb95127839d3a7393433ad6536d0a9cad2f426
font_02_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 16288 bytes
SHA-256: 759359b8c85d18ba65fcc331c2eaa23ab4f45566bd99d7798bb8769b007dc176