Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d372f96ac3997f…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 21:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d1f346f64ebc1736c3fe8083dbb6ef92 SHA-1: 557b28e8e764d5ecacf52969635f5b27ca858b24 SHA-256: 50d372f96ac3997f2c8eb7ed4c90a842405d9900b67265a691faf23607005f8f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is flagged as a phishing lure due to its image-only nature and clickable action. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://bankubezpieczen.pl/userfiles/file/zapejasevotowag.pdf In PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210902214746.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/tatugikugerami.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/kuripagivudesodom.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/52282295232.pdfIn PDF document text
    • https://alohasafaris.com/files/82566465499.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/madakivugimezovepamuxi.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/64391430693.pdfIn PDF document text
    • https://trieurodata.ro/images/file/sidutabavowabevav.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/dofirozowafe.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/rijoxusuzunimawedirar.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/7493458759.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/71427046505.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/kukadeduvaz.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/bosopekifi.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xemunugitelilasedituvi.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/94418562735.pdfIn PDF document text
    • http://th-hl.com///upload/files/tixunerar.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/75388983041.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/kivuz.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/bawenaxopilawanadedowa.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/5691893229.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/40505795358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=atla+watch+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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 10332 bytes
SHA-256: 3422f139ffbc49b4fe05dbef26881b04c34820d76e27f921bfa1da4458c00a69
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 13976 bytes
SHA-256: 28f6e094b55f76ec9c220a1618b1a13c35d840a390aba2875ec3a5798fc14c73
font_02_sfnt_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1