Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1764bffc58b3a4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-08 16:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43f0f3ea271b5fc7421ffdca08adabf0 SHA-1: 106264f402918b4b8619155622a656a5412fdbe5 SHA-256: 9a1764bffc58b3a47fb12608e8ab840b0cc1a88cf50835ece60841cf8d121726
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious sites or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=metodologi+penelitian+kesehatan+pdf PDF link annotation
    • http://elitaliaweb.it/upload/file/44822315327.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/tofikinajizid.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/zakopesoworekekudune.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310dfbafef6---71378574956.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rewigulabit.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/22144690610.pdfIn PDF document text
    • http://gnox.vn/upload/files/92171195448.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/73879223402.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wuxujuniwerosoxodujeguzu.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/latamujeladovega.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/betekenejaxazani.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/vafadaxez.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/893700099.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/tetumimupe.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/44901919564.pdfIn PDF document text
    • http://maihome.hu/admin1/file/37542566665.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/73350868130.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/83646970506.pdfIn PDF document text
    • http://potya.com/pamatarabowowoweb.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/48835356021.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/burubiwidunufusija.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/71594057025.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/50901003059.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/36399128863.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/pozup.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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 10760 bytes
SHA-256: 4fcc8820af112ca4078293f59b9c56dff7d3b4b86366eceb25a9b98507dd3fc8
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 17028 bytes
SHA-256: d5b75e3a7bbc99392b0dad841a1166fe735fb46d8b790a474a2da7ee4e2b8040
font_02_sfnt_off0001146a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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