Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dc3ef2a8e114eb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-09 19:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 033bbf1e7bb94a9c5ef63c2edf79b80f SHA-1: 7575d4d1bb5b6e96bce6507d07415cb9405baea5 SHA-256: d4dc3ef2a8e114ebdd6d083588f9eec1322c2534f67e6838bbd578cee384944a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites. The presence of embedded JavaScript suggests an attempt to execute code or further obfuscate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/zudupexajulo.pdf In PDF document text
    • http://kcemsp.org/upload/editor/file/21541553033.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/gelilulewuwesovuzepoxun.pdfIn PDF document text
    • http://mayjack.com/upload/files/5481480198.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3683241a8c3df2aa8444859f1a5c05f8/14320944971.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/denofesusoxapisubeluzike.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/rijopagive.pdfIn PDF document text
    • http://domosplast.hu/files/file/56317901518.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/93777792583.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d22cb556c---muviluxotus.pdfIn PDF document text
    • http://popmetre.com/news/files/loxeperirafox.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/71390080869.pdfIn PDF document text
    • https://strechybenesov.cz/content/59057600353.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/75556140768.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/lotojibowapobulevivotepi.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/tibizawuzosevetisobif.pdfIn PDF document text
    • http://hijoin.hu/editor_up/39323887811.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/rovalidizofaturepuvunuto.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/21856762487.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sobivum.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/27163265284.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/17143274671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+ghost+bride+kim+chiu+full+movie+online+freePDF 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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 17928 bytes
SHA-256: e91bfbd359b9ad3742c8b86d4e9a6f10ffe9d393a5553dbb686823d420159747
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 11120 bytes
SHA-256: 7a0d37d8a0cce2e34e6e061474b8726289d7a0eba81d861726edc85bd873af45

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