Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6a4fca9c7e0cf2…

MALICIOUS

PDF

91.0 KB Created: 2021-09-18 03:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 963decb5f04fe349d93b0bd847bc4160 SHA-1: 882acecf64cecdacde74b225571e31bcfab0b3cd SHA-256: 6d6a4fca9c7e0cf2c0ba05365f4259e38da6ca4010d9e4beef667f244c35816a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious or phishing sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=finite+and+infinite+games+james+carse+pdf PDF link annotation
    • https://clinicamanila.com/ckfinder/userfiles/files/kozelojidifiv.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/18531701047.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/jajimikuvilerosakobifal.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/20304525861.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/wopadaxikas.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/zosorajewobogegaxezufura.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/10088613504.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/77091991294.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/powadasowikixonub.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/pekawowenadutupoxedilaka.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/57769022439.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/38092795655.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/44178387240.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210915165553.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nanekekatowenilegivop.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/14734948429.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/51953483205.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92151143993.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/wowifaloduziro.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xuvuvitotejogigebisexa.pdfIn PDF document text
    • http://prestopc.it/upload/file/6660520987.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ihvr4u1h3ef5uckbpvtc3gjsm6/mugididanaposojaminoneta.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/ruxexefegevujaranufi.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_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 10904 bytes
SHA-256: 6d479911f3cfc5ab8e32e4e886e3c8330971b8ed9008f2f7732dba2c79cdb74b
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 18720 bytes
SHA-256: ccf72a2e7d0513c3eb4f3cfee6936bc5cdb97d4b99183adee104c162b19fd4a4

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