Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e055bdf53e23b84…

MALICIOUS

PDF

101.0 KB Created: 2021-09-10 17:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc34d7709f2d8b5a1178697be9d02cba SHA-1: d726d2c66ea77c2d2290ba70ef26fb311a075c9b SHA-256: 1e055bdf53e23b843065e1fa6e5aa39b29d84ff0cda10193f7139c28adac33cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers strongly indicate maliciousness, with the ML classifier outputting a score of 0.998. The presence of external URIs and the overall structure suggest this PDF is intended to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pixomot.ru/uplcv?utm_term=jungle+book+characters+snake PDF link annotation
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136778d4bb31---65870409047.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/zarugosajukazajewafowas.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/42399556844.pdfIn PDF document text
    • http://grandviewcommunity.com/userimages/sipam.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jatifipoti.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/todazulilajezawibusi.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/defelusimonosob.pdfIn PDF document text
    • http://hidropro.hu/upload/tinawegevi.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/75429912674.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/98558521687.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/78971949767.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/wekigidotifike.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/34098909713.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7ca1ae71---felapefofavujaninibidot.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/86052080637.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/saralapusafinudiwoxubizu.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7825081238.pdfIn PDF document text
    • http://www.agot.pl/upload/file/fexivelifivolufofuxiz.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/katotodasifi.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/lufudodibubekisepuxugiji.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/61964091266.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_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 18500 bytes
SHA-256: d4cd601ca3d3ee0ca8f513b134c7279712dbd2407de6cab99408a0fe8d22fd78
font_01_sfnt_off0001559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB6 10740 bytes
SHA-256: a3ebf6768dad5263256c26595f64155a58ba794d64f11147d7f4007451164797

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