Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5c12bf8ad61d74…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 09:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1cf40237008d1f95790223698f5268b SHA-1: c784b262c27b969b2992313b0477e675106a57aa SHA-256: bb5c12bf8ad61d74b5f41117d7928229906e09160c5403e0621ba6fa1eeef7ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dayuntang.com/assets/uploads/ckedit/files/20210909093945.pdf In PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/97655296408.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/31164171703.pdfIn PDF document text
    • http://hla.vn/upload/files/4563017646.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/dalarajuruzekaka.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/rizedukalitivapagavup.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210903084448.pdfIn PDF document text
    • http://boki.hu/editor_up/rozizaderowel.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/36289332588.pdfIn PDF document text
    • https://viceda.com/userfiles/file/38340012641.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/55934413753.pdfIn PDF document text
    • http://santabruna.cl/upload/file/zajekivekuw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a7a13735---xaxukanawapuxuzajawoweno.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/82647472871.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/17356963833.pdfIn PDF document text
    • http://zeci.nl/im/image/nasuxukafogalagexasimur.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/jalavuvizofikalaweta.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210909_003753.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/83442008448.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/fikuwenotadupeji.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/fokekaku.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/87048692944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bhag+milkha+bhag+full+movie+download+moviescounterPDF 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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 18100 bytes
SHA-256: 511f10d1e7b0df16434c37ea0d0ef4bbd8fd0b155e1d3b3adea5121c5d2db066
font_02_sfnt_off00011d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D58 11460 bytes
SHA-256: ef9bf9c4565a8c8c8e2e506c35c97d246cb3da4ebf3eff26e29850aadbac4885

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