Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a76f2f015280cc8…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 01:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a3b9d5e2629ae1af73ae0d4e0397978 SHA-1: 02f96d3b83226b0ab905d024b325c02e80f547d0 SHA-256: 1a76f2f015280cc8fe8c0947b6f71c61dd333bdb20ab00159d9b436874880e10
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT heuristic. This script is likely responsible for the redirection to various external URLs, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm the malicious nature of the file, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://loscogliodifavignana.it/userfiles/files/savulevil.pdf In PDF document text
    • http://t-p-fortune.com/userfiles/file/lobepoted.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/sivotuvukodowubawi.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/86349890719.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/bepegufazotowovipat.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/sifizoxoju.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/3683288105.pdfIn PDF document text
    • https://esz.jp/img/editor/files/zaxumelomutanibaje.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/tegezuxugenibu.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wikujorofijuwozapinaveli.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/mitavakabevizanodifetut.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/nuzibakenotonux.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zosorajewobogegaxezufura.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mepawuzukijinerupakabo.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/sasulanusib.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/68082964771.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zotabazevenalakitaj.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/67701931693.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/80975452783.pdfIn PDF document text
    • http://www.buildonhope.org/file/kedabegiruragevurifelelo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6dbed9a5---44566825449.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d34dfb136443c9360b8dce8ea2b7bcc/zirekakewisefipojumofafab.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/befododepororoninelelilu.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/vujafetexileputil.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/51896072073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=happy+wheels+getting+over+itPDF 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_off0000da01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16740 bytes
SHA-256: ed0d2c26ebf3b2fd193af7a0dbde0ad78e39a0eb94f144325c7eeff43b4d3863
font_02_sfnt_off00011d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D27 10788 bytes
SHA-256: 4aaa31374801103507db0b8db45d343b3864e8b4a79b982e14759bcf14e9129b