Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d5fdf25f639d8…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 06:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca4be63dfb851171e2a219e012d88899 SHA-1: ad0197302b4f81d483d7d97d6c926cc6036d9419 SHA-256: 337d5fdf25f639d88584c53c1c425ab0f5b90f7e2d6396ca21c27231648ec862
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are hosted on disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=minecraft+medieval+village+ideas PDF link annotation
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rujixuz.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/jatosov.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wimeruzanumidusesabo.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210906105724.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kupakewakosebu.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/xaluxekibotovoperalikal.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/41696416030.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/vasisiw.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/walelosesaxadedo.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/88119031494.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/5199346527.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/54117510590.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/33f22556e828f5c7657084578b88b4ec/56293314151.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/29527363700.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/77799939536.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16140382cd4f39---48059154140.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/kazebojanesela.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44953937786.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/90762064765.pdfIn PDF document text
    • http://handgun.ee/media/file/81086732631.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/niromamepolimusawu.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630518454.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/sopeda.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_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 10756 bytes
SHA-256: d46c3fb139ed39f9abfe9efe9eb98e435584ecb3aa40f4e1c5ae7dae6be69524
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 16876 bytes
SHA-256: e0c322bc64870d516f14afc8717737964291f410e3a7fb8a32dca65e5daea602

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