Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8416cfd6d2db193…

MALICIOUS

PDF

86.5 KB Created: 2021-09-19 22:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe7d32617bd960fe1fbcb9a08834ea52 SHA-1: 2d253231b2fbf3f1f0494575735f45508a508b64 SHA-256: e8416cfd6d2db1930cf310dac0657295ac7699d82e02470e7cc4c43f8c622df3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613812f6f0345---48131907424.pdf In PDF document text
    • http://solo-reisen.com/media/images/file/wolojepitasev.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/34151231750.pdfIn PDF document text
    • https://securitydm.com/slicice/file/menuzaj.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/61402306064.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/80018513153.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/xiruwijiwanago.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/54653494955.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/lifowukego.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/divifosetewena.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/12272894156.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/befuxu.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/68829156107.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/12677043781.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/subexujuwudiwizewexarew.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/735817aac1b77f15b339a06271704887/71745022851.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/49714755652.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/kasinavazojikavefulomo.pdfIn PDF document text
    • http://becucci.it/userfiles/files/dopuboditojobigomiluravuj.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/vazorobe.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/82724182231.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/43688133872.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/55400833150.pdfIn PDF document text
    • http://techmechengineers.com/uploads/79173831517.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/69006007903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+jump+force+mugen+androidPDF 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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 17828 bytes
SHA-256: a8ef0ec5a8735f9ecad6609f75f2544426f88d632fc8268a600026db7eedd9eb
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 11012 bytes
SHA-256: 4645a95a16e88745098ef99653cb5653f28f1eb175285cf0401f82da0adda9fd
font_02_sfnt_off000132ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1