Malicious PDF — malware analysis report

Static analysis result for SHA-256 509c71f31ce08a13…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 05:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb54131d475460c15fa4df560b612548 SHA-1: 4512a0cedc2066279d8522e60cb3b1a5d304edb6 SHA-256: 509c71f31ce08a1379d16e7e03eb11ad6c76bb8c126491ab69bb013a201130be
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest this document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://irlanc.ru/uplcv?utm_term=n8000+android+5 PDF link annotation
    • http://re-media.ru/foto/ck/files/fumedomuluk.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/6044095374.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/35375687145.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/potowivurejoxeramod.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/8289804811.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/89898234099.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/30004209374.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/95496367432.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zimizupi.pdfIn PDF document text
    • http://sdes.in/uploads/33142731997.pdfIn PDF document text
    • https://renault-service.com/userfiles/fumudiginugom.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/301273597.pdfIn PDF document text
    • http://duef.ru/public/file/waziledagelogavolabe.pdfIn PDF document text
    • https://avflash.nl/upload/files/70357564674.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/39012880463.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/29618167684.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bc5a7b56bb5105e156eb28134698fa5/44555042593.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/rezagamigemazufetobuw.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/14147796874.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/jijivopedibife.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/18544979765.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/dogagitozutizoxoxasomilep.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/bixanakosuxekefas.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/25802347907.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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 18232 bytes
SHA-256: daa315a9875b873bf1c1008cdf2ddcf1ec5b06256b5214cdb8572d9c49efefe7
font_02_sfnt_off0001121a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121A 10240 bytes
SHA-256: f29c294a2d2c880e555201811892a5c1afdd2930a7b3c806ffaa2a51491563b3

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