Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75549676d462d04…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 00:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c55c8c25ddf584eb04e05c629a18ff7 SHA-1: 3c268e8c9aff5bc24a376ce16c523787ea036cea SHA-256: b75549676d462d048ed668aa246b185c83682236b8d34cf293c367ad9a8be413
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the link farm nature of the document, designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=lord+of+the+flies+packet PDF link annotation
    • http://zenobiacultura.it/userfiles/file///9668582762.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/xovozenutemiku.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/mufazenuzujigabibaxa.pdfIn PDF document text
    • http://centrons.com/uploaded/file/5754961586143b0762a88e.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/ruduzapunojo.pdfIn PDF document text
    • https://bawauang.com/contents/files/85324001036.pdfIn PDF document text
    • https://led7.ru/file/zepukagixeniperewojoguwa.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/69888117418.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/71136357343.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/82590030692.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/surobinofazogenaguxosezog.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/9874068524.pdfIn PDF document text
    • http://www.520amis.com/upload/files/52080488111.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/xotena.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4ac40e4671b4eb435a959250eaa4f58b/vefafatowofowopigoga.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/89965834766.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/kuburupiw.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/xefitopezeguga.pdfIn PDF document text
    • http://dogable.de/userfiles/file/87061902544.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/nutazifewixekuk.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/wozozapefamokeromenupagu.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/51911396896.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/72839855042.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/mujorimatekiseduxuzo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/wedetagigonizafener.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 10660 bytes
SHA-256: 6c1a8ee37a0ef9140580c6ed29252b706f21dedf1370173dce92c97e262328e2
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 19348 bytes
SHA-256: 98575eba2df75395ec12835644c51e28beff3afde46f126bad498316f97124c9
font_02_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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