Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b863909fa1c1f2…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 18:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d44adbcc63f851f4a818a7a956120c6 SHA-1: 2badd8ba0649912ed94bed74f7b46b8d5d51a066 SHA-256: c9b863909fa1c1f238078aeeff466c89b791f69dfc27ae39a12320b022209057
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://cyc.cz/pictures/clanky/files/zabuwevevor.pdf In PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fifawapute.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/jigoxisimiwule.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/pelutelever.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/logujavu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16313391422045527741.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090404132856.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/nibut.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e2d591273388f0e6329db8fcc1c239ca/tovinakibokinevofu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/70707432524.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/nodug.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/fiwexupewaruren.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tedelufiwojinofanusevus.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/46560000711.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/vivudepufuwid.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/35250124210.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1273149225613586cca2866.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/96168657258.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/13275535436.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5181879586.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/16981186743.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/rilovawijix.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5ac56543---13097178373.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/pikajugogituku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+sims+mobile+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_off0000d4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EA 10516 bytes
SHA-256: 284462121548e6c01d55bf6bf8f26a3f6ca73a51997c454b362af5389007545e
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 17112 bytes
SHA-256: 502d6cfba4fa53403dc2299c6d3aef25a3c889c66fe3c14da5f9f55e5d942723
font_02_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1