Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87187723d227f6b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 00:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dc44fb0e35610091a69b894a5191ad4 SHA-1: 66d1a69a8ac51bbf11b4af390fc0119feddb7cdf SHA-256: c87187723d227f6b1ba8220a7bfa82e691bf0f27e9430f98105d2e076e71b41e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content, likely leading to the execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=minecraft+stolen+account+list PDF link annotation
    • https://hantverkarenisandby.se/UserFiles/files/5671870708.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/73765432065.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/sixuriruwamog.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/53060772550.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/pufofegezovifulumidake.pdfIn PDF document text
    • http://medrea.ru/upload/files/jolonefofepofokinoka.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/88105031150.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/59627523961.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/xudisidotizobukaz.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/zakexozopigezaxuzi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/ferisodope.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/sokuwepet.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/91621616075.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109090330594186.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907095522205408.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vibinutibasuxosoramunabil.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/17504537476.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/59513473010.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fexobobumikogu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/defulamukide.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/tupexazozujix.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/33200090389.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/93234819595.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/80634223300.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_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 17420 bytes
SHA-256: 2af6f6ec969b0896d33ca53b1472bee857460ba9dbf0f7970fc05b02b3cba50e
font_01_sfnt_off0000f949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 10420 bytes
SHA-256: 1445ffe0e1fc54afb803c58bc54b0a57b5e2bed880f7e8660cc6158a3805c91b
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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