Malicious PDF — malware analysis report

Static analysis result for SHA-256 7516b471c847c6fc…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 02:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd945d85d689d6af6a9be127c4a4db8e SHA-1: 7cd024772ea40582f97ebf684ef648a42a06d28b SHA-256: 7516b471c847c6fc154915f3e7497473dd57ddfb5490b76c21d5f208bbda0e97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://fpole.ru/sadm_files/wasajuraz.pdf In PDF document text
    • https://trystsalonri.com/images/file/82358481068.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161409691b20af---tigigidoxemowijupizux.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/7306393961.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/bigud.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/texeluvabugikonamogojupi.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/53608017710.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/fonuxovi.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/55975170863.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/75101553787.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/latepalejinabefumib.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/80425805954.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/2601411227.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/47320174495.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/mulixawub.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405d48b0c88---zixunejo.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/davirutuzumuwusitudumix.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/pozunokapuneze.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/najixetozod.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/gujivabenub.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/xetud.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vuwuvomuduvarewojag.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/59045543369.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/rulepepirulekeze.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/patuvigifesonotonax.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/61383459104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=top+five+biggest+country+in+the+worldPDF 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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 17948 bytes
SHA-256: 80d47ebc640ab705558efcd0bedc999de47bfedb430e4db3abe27b6915786937
font_01_sfnt_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 11208 bytes
SHA-256: 613336630eaa8b3013d702b25be2c93489e9a2187974f383f22205a16d88ac5b
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1