Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e04afd4911ecde0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 21:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3ce0a2911bee118805fc602f5c40429 SHA-1: 4a6e4b050f73dfeacea98639c065bb5c44a05703 SHA-256: 9e04afd4911ecde07df22cde6ffb6779dd4d09a4794d4bb552a7fdfc5e83bc41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=abrir+exe+en+android PDF link annotation
    • https://mccartha-cobb.com/userfiles/files/xepikipivixadupogogadare.pdfIn PDF document text
    • https://badoza.net/userfiles/file/zaxulotefoxoki.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/jupozutetagojesiwet.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/233268405.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/27096643275.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/61980783486.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/welajifasekoxisovujepimiz.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kojuxofasiwexudapenoxa.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/92995077910.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/zupezazovuwazin.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/goliwanoladuwiguza.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/kidajutebilejujeteluzowu.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614931e48c2de---zerowukepuwitozetibef.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e886832e2f---ginaruxexijaz.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/vemupobawikizinodarizo.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/dijugewegosuvitijojakes.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/73913394930.pdfIn PDF document text
    • http://hkalc.com/userfiles/pavubodoba.pdfIn PDF document text
    • https://stormester.no/files/file/22033201309.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/46442572879.pdfIn PDF document text
    • http://chinalabware.es/d/files/92459270676.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/kewawilidibo.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pimububejisobavoraguzunun.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/vakuxadal.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/72838727520.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_off0000e502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE502 10152 bytes
SHA-256: b9e98eda3240579a09438bce4f39af16b965f5f0597b19debcf46a2094449b8c
font_01_sfnt_off0000fbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E3 19576 bytes
SHA-256: 526c5eb183813d3c498e2e5265c75e3a6e414420045630b8cf74a1a1b2e1fa29