Malicious PDF — malware analysis report

Static analysis result for SHA-256 c149cef575c29db3…

MALICIOUS

PDF

74.2 KB Created: 2021-10-04 01:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1bd5bde78f09600f883bb32604bb48a4 SHA-1: d8e7d448aa4002ddfc53f6af8b88aba414c8a3cd SHA-256: c149cef575c29db3cff25e70e152df7d9574fbd885c92a1007d26d63058321f7
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=linux+pdf+reader+with+annotations PDF link annotation
    • https://cet.sk/res/file/53482591328.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-23-00-43-34-919pGZ4V.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/nogem.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/sawisusa.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/39185046026.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/zodiwezoworepisajurot.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/33702439168.pdfIn PDF document text
    • http://devveb.net/userfiles/file/62014810674.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/18539811699.pdfIn PDF document text
    • http://epicridesnepal.com/files/bavawaruvefo.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/gukusivifapifu.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/fidarebikojez.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/lexaxibapagumurozizedazas.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210925_113215.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138221302084---46075631467.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/51977019739.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/zonofomaborigu.pdfIn PDF document text
    • http://przybyszewski.org/image/file/jexidor.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/55654650084.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/pumelimisalikusebipap.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zifafiboge.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/4966419721.pdfIn PDF document text
    • https://eguiders.com/uploads/latisumavobutuzer.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_off0000b54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54A 10796 bytes
SHA-256: c096c33c8de3130851c85119170f4329b2637107fea255f7251ff02f8126728b
font_01_sfnt_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 20208 bytes
SHA-256: 0dac559ab67e62ce25d7fb144b3258e9b72859f36e2897bdf5292c60fef987ae

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