Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb94821986c4e51…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 13:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24f16cba053a6f5bb8b2c6f6cacc9a52 SHA-1: 6f001f02e9bf17fd29fff96bea2d022e513eb622 SHA-256: bdb94821986c4e51ff941826ff1bfd0d00de4fa33949f61d3ea6d1e08bd0d4f1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or scam attempt to trick users into downloading further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/90713699679.pdf In PDF document text
    • https://my-natural-style.net/upload/files/18098438919.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/16374819774.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/farumogemam.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/kagelekil.pdfIn PDF document text
    • http://w-mill.jp/images/file/22807904200.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/bozapivozevodojatok.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7306564f2---xurabo.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zukotitapatobujojiveku.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/dedusodatulorapakomafosi.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/39253864649.pdfIn PDF document text
    • http://asid.rw/userfiles/file/22110204658.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/73165748232.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/15764324317.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/zuzumobajatunepew.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sunuzusakemaf.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/zijasefepemigilakiwo.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/328952856.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://skatrip.com/basefile/skatripcom/files/ramemuwexaferufege.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/8650046888.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/fimavebepod.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ebb433656---3728539336.pdfIn PDF document text
    • http://qdcmd.com/data/files/56957383749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=reading+level+stuart+littlePDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 18296 bytes
SHA-256: f66c0066052c68cb24d6fa52ddaec87e6a7144b43f623c6282f56899c1e249b7
font_01_sfnt_off0000fca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 10512 bytes
SHA-256: fe771fa8654fd3444213bb673670cc87579663a5cbb31f085b44cff1b4dc9eff