Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c94635bb6b93099…

MALICIOUS

PDF

92.1 KB Created: 2021-09-09 17:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 906fcd00aeaf947d702fc766202e963a SHA-1: 9d17b33b45538d6fa5e7863578d5f7ac40d4b46a SHA-256: 7c94635bb6b930994ae38c34889855ff0add6afc5f51842f96d4be80e27a5abe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The high number of external URIs, many pointing to disposable domains, further supports a phishing or malware distribution campaign. ClamAV and ML classifiers confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mavibusiness.it/file/musopamomug.pdf In PDF document text
    • https://ymvii.com/admin/upload/files/walixosikuwi.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/jazof.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/dorajefivovimovopik.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/64914776689.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/sowukasejajirakiwezejuwi.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/99424231734.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wamubinegiwowo.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/99696693255.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/zubetarilujalumo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6ee5dede---63094591428.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/20518891486.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/27079702860.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/fotafe.pdfIn PDF document text
    • https://edusfera.pl/upload/file/wekok.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202194521287331.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/wusuvabefusekeza.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/28936844548.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/naxesuwirerewujikaparar.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613696ed32477---sinajavesuxaxi.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/pofalerelomosu.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_05981D9EAEFFAF34.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/51833285119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=fast+and+furious+freePDF 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_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10380 bytes
SHA-256: 2d1b812a70f5df85b76143b6ec5a84c9dd08df4de311cbb10bf0a8c5deda4ae4
font_01_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 19676 bytes
SHA-256: 810c017ead8ee7d602a006014b685f9b372626bc43d382c1a68651ce802e6e49

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