Malicious PDF — malware analysis report

Static analysis result for SHA-256 28394f1329c6723c…

MALICIOUS

PDF

67.3 KB Created: 2021-09-25 20:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8320b7ad0a71fedb3fb2bbe41135800 SHA-1: f5ec8a5d22a188dbfec3bf6fafff255844607cf8 SHA-256: 28394f1329c6723c0ef86f833f11448cc44065a3e719583c22652a81ce909d36
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including an image-only document with an action trigger. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 67 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://crysiq.ru/uplcv?utm_term=kelebihan+iphone+dibanding+android+lainnya PDF link annotation
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/poninijuluw.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90061871674.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tekujuxe.pdfIn PDF document text
    • http://full814.com/upload/files/dojofuk.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/zaruwofovomenerubaruv.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/42623506035.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/logibibilotevebenuni.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/50247843526.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/dalesavakalefowaxapisutel.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/85873670955.pdfIn PDF document text
    • https://epiphanych.com/images/file/25131546718.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nugufibakiviwinuwilod.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109140502074646.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/77728599209.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/17472175636.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c5df143a5827a766052bbbee8c912412/gosano.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/13232848624.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/setitogabofejufi.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/60949433886.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nedenofumapo.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/xonama.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38834029035.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_off0000ac22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC22 13604 bytes
SHA-256: 40c668478e149152db6010e987959799ca0c4758d005f68cecf28d3d51fa5508
font_01_sfnt_off0000cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 10652 bytes
SHA-256: 9f74d882ae490e6ae0228f515a6d8b310352df9ced73a3c56e740ad11222b55b