Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4873d00e8073e75…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 22:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd5e8e998c325c5df907a6b9c41834b2 SHA-1: 199e680fa5eb2e938f2e846a15f9ba49970b14a3 SHA-256: e4873d00e8073e75047c3c07762530e83249ac0965d06543c105004e078f282e
142 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including one pointing to a PDF file on a potentially disposable host, suggests the document is designed to exploit users. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://catamma.ru/uplcv?utm_term=conjuring+tamil+movie+free+download PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e85d96873---riregub.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/10729687661.pdfIn PDF document text
    • https://linardi.ru/files/file/59598221375.pdfIn PDF document text
    • https://mar3ol.com/Files/files/pepigewifosurabolezunobem.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/ladofud.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/bimuzugojujidituv.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/jegarafasezusenuruzaz.pdfIn PDF document text
    • http://chromavials.com/d/files/bonej.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/revaxonokuvemelusiguwipog.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/74881079942.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bumizududumoxenofelal.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/64405178365.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/44991649475.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/32237143805.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/17288571698.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/73723883550.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/venavusokaj.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/bazixelireder.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/bularoxesanuzide.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zulepaponufomeporeruz.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/74893067621.pdfIn PDF document text
    • 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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 17692 bytes
SHA-256: 6cb9caff4997bed616aba9f05c0e869178504bd8a4b3446025787a300a647568
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 10940 bytes
SHA-256: 8d74f598377dffcb4bf090a3eeb3dfd988a315c55ef58cf30a5e429cce25b5d3