Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc5926b2ef60a42…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 17:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e250cfdc683d128cde90290f86380539 SHA-1: b3096679cd3fb14e198c9040325cff44f1b14401 SHA-256: 7bc5926b2ef60a420b2a38ec90278b761a6919c2363341211a0fc43f0180f1b9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of a 'download button' heuristic and numerous links to PDF files suggests a lure to download a secondary payload. The document body was unreadable, but the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://heaig.org/editor/ckfinder/userfiles/files/lokalanur.pdf In PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/sekifagopirorinakixabige.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/88265098686.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/39406133706.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/28582615678.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/movaxav.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161337a9980a3c---47841248159.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/fadazipivuwoboxasul.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/budinojesuponazamet.pdfIn PDF document text
    • http://holzweiss.at/49356329145.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/sorosezuwaxodon.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/raruvafajipukamudo.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/38049818072.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/78520782127.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb8247e31---14461630931.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/70142634469.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/kopokererejoso.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_001151.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/23427738603.pdfIn PDF document text
    • http://myphamasia.net/upload/files/fapopax.pdfIn PDF document text
    • http://newmob.it/userfiles/files/badefipefuvepifivaf.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210903_031208.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/1810328354.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/89428511095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=root+words+prefixes+and+suffixes+worksheetsPDF 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_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 10972 bytes
SHA-256: 1457f1b1be5233399e1fb9253459c75501cfd6201b2e23fa757a63922b246614
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11738 17684 bytes
SHA-256: 8e353d8c9578d7b73bde05a513bb63cbeb5e42e989d4a5aba9c2a0524111d9b7

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