Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e6521e7fd5a92e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 07:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a1da301c2dd6ac11b4cc30780ce79f1 SHA-1: 5725eb88370fbbfca80c5195974095ef8d932510 SHA-256: d4e6521e7fd5a92ef6ea66593d649ece39546c768153b568b2cde506332f3b51
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=panda+video+compressor+apk+pro PDF link annotation
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/22368840377.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/82748922961.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/52130777352.pdfIn PDF document text
    • http://www.77ice.com/upload/files/tifolidupeje.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/87123074899.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/98289795386.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/nasijexedipuwo.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/barenidabuvomisadozusen.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/povapuvegudavumujite.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1399ca531282ea3d73c2436976a4d0a4/12050267563.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/paxupukid.pdfIn PDF document text
    • https://eklyps.net/images/file/ziwogajol.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vowinevagamikowozeniki.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/14135157398.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907045142916586.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/zuroxakibi.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/xivuremaxodu.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/bemuvezibisegufuxo.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/fonelozigesagixoxuferux.pdfIn PDF document text
    • http://schokofontaenen.de/idata/34439367219.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/61213553990.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ad2196fa---93009610617.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/tudefixaxewosej.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_152152.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/86595759525.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_off0000bdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD1 15988 bytes
SHA-256: 44275fdae5f6bfbf7c91d867c053abefd06e0670bfb4220b56a0c6f9e44f5134
font_01_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 10692 bytes
SHA-256: a20c351b2be731ceda2e1a9d6cfe2b95752d46a648dfb6f1e4162c8284d73f2f