Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b105e5f8e83853…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 17:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0661a1087efb7ff0bbc660c4cc5d740b SHA-1: 1cf5e194b8344c14be270754b00049b9c3ed55d1 SHA-256: 47b105e5f8e838539ea1007aaa4aa6d4a3d4e3a362fc4e2c4a697d1c85a96594
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=enlight+videoleap+apk PDF link annotation
    • https://educationindiajournal.org/ckfinder/userfiles/files/faniketakinegokib.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/gumidomemikelikagufuzew.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/68946992965.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/latoz.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/6544234079.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kijug.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/1631345148.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/farokon.pdfIn PDF document text
    • https://polandpools.com/contents/files/41369948160.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/vapumijefid.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fagewuketorikedakikakanab.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/wazuzexozuzikax.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/3405680049.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/74064859023.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc8c494e4---pomovugabiroduselugadid.pdfIn PDF document text
    • http://imi.vc/upload/files/17016845550.pdfIn PDF document text
    • http://tzsunup.com/upload/56811113026.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/47024899811.pdfIn PDF document text
    • http://fxmeat.com/upload/file/350c5c1d683426a07f53c1d80a68e988.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613192fd81545---goduvarapenesupagiviwer.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/73522015589.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/3916123376.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/84841788989.pdfIn PDF document text
    • https://hobbypet.cz/files/file/78795615239.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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC92 17452 bytes
SHA-256: 8c81ac386dc7545cea156aa22e416805aeaba7b8f5f7c4af31df5d6e74c0c2e3
font_02_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 10544 bytes
SHA-256: 392c076bda253b5fc4971e86752c0e19f22f684148aa62e398b847ca420d3a8b