Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adc02e27f2f745c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 19:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1dc80bb241d2c4bdcd04548bd5e806d SHA-1: 574d05971209c2696a43794883c97f59085070f8 SHA-256: 4adc02e27f2f745c3b13e1a592e2d4e612db79575d22f4a892e4f073e4b8047f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=android+auto+voice+commands PDF link annotation
    • http://learnazia.com/fck/imagesfile/buzoxopopikilirewofela.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/pumilumovenatafefolesen.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/wofibanelopotidokawiziwe.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/juzofirivurujezugedop.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091806494991.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e5efb3531f9249c1b03d9d5b6df35e8b/getijujugenod.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/najuzojet.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/86755980540.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55270761284.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/9853143206.pdfIn PDF document text
    • http://pasted-radio.de/web/files/1847949483.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348d5376f4f---95140398894.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/50519594429.pdfIn PDF document text
    • http://liyangah.com/Upload/file/80133697939.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/wixapumopodobinovuna.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/zepuwoxodavom.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/kogilebode.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/21369747357.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/vegojufezupitobofotakib.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/62461755542.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/84273583994.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zidef.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/61275126608.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/94709947470.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_off0000b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C5 15180 bytes
SHA-256: 52a4e94c389c1cd323d42f7f9421cdb74c8ffdcdac2765081611da9313725fff
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10632 bytes
SHA-256: 93bf8b6fdc0f76ce7ce02c6d2f321256c8158bccc114812968b0cd5af8c90a03
font_02_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1