Malicious PDF — malware analysis report

Static analysis result for SHA-256 810e439dbc2d2368…

MALICIOUS

PDF

79.1 KB Created: 2021-11-01 11:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 83ddf5cb588309fb7fe9f995a933f79b SHA-1: 90fcc18cc6f0e6dbaa9a03e84be9ad60684481da SHA-256: 810e439dbc2d23689c06d269e5eeab46452387a90a4848ab9ebfd39989d98076
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URIs strongly suggest it's used as a lure to redirect users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=manual+for+gloucestershire+streets PDF link annotation
    • https://bd-sokolovska.eu/userfiles/file/wined.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/xesatubawusedo.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/bipixutadizurosu.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/mefofevevisilasa.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/10626997366.pdfIn PDF document text
    • https://inmasa.com/imatges/file/65044091998.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/dovitupulumaki.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/61343726006.pdfIn PDF document text
    • http://chinalabware.ru/d/files/74310533887.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/31052715486.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161779fd841d12---xapukovomubimigedifin.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/48361031315.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/zovovodame.pdfIn PDF document text
    • http://teknis.it/userfiles/files/64555098478.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/zurepirezopevaduwoninaw.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/8947235564.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/xivutuxijuxiziduxipuzoge.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/70764213318.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/7243138951.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/32571880355.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/96828542915.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/77423122974.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/kuzifapafobojupituke.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0cf5c7bdb632ed45abe3207140ca0f5d/bubokugibetixitizeregubej.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_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 10708 bytes
SHA-256: dc0370bb75c0e96b63d70e8883db0a1beb00e2555ffde4d927ab93e642153b28
font_02_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 16212 bytes
SHA-256: fe02ba059604ba4a729d1b635e1fa72905fcc79a9e9f202b121b66639001b160

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