Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e451dffb0857a17…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e17b49bc14f673acdb50d3ba41f28cfe SHA-1: e6f4fdf226b43aa657bd30d15fce6c615f133575 SHA-256: 0e451dffb0857a17286d3ae2302ed4833159c4a0ff8a01e006d123c1a1f9f779
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=how+to+know+who+viewed+your+tiktok+videos PDF link annotation
    • http://smartpaintingplus.com/userfiles/files/14682750834.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/21778155020.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/70759394844.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/34669000626.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/75835101625.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/rubimunafab.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/31249022551.pdfIn PDF document text
    • https://premiersuli.hu/files/files/mexazezukufed.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/63479996910.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/norawisi.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/14738076019.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/95884543931.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613590400d888---pezojoxuneki.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/17737772013.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec71f3fcd---banodipod.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/71231817155.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/zufabinazedori.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/webusifopemilobelosupilo.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/sijijatogepofanexizigi.pdfIn PDF document text
    • http://rrarental.org/upload/file/35400850410.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/witazopegojawenigisidodog.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sozixulirewepomivemota.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///dotolumofumexi.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/19062074103.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/gizisozoxumemuzonibujuw.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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 18580 bytes
SHA-256: 2c421e09cc874d538502fe071de61928ec1eeec0d11c155e2c94ada234234940
font_02_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 10584 bytes
SHA-256: 513b5e302d6a792ec903e343fc445bead37543f3678229e24c88452ea13bd41d

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