Malicious PDF — malware analysis report

Static analysis result for SHA-256 c628856d9d465491…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 09:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d248bc04c1b3eaee43ed64d532901b64 SHA-1: f6c11ee95777e0ed0183ace0d384da09498e533b SHA-256: c628856d9d46549112af5953f704724fd9d368439c23419ab98352930982eb51
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious actions. It also features numerous external URIs pointing to disposable hosting, flagged as a link farm. The ML classifier strongly indicates maliciousness, suggesting the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=curricular+knowledge+definition PDF link annotation
    • http://nwatchonline.net/userfiles/file/1095138481.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/wisowowag.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/22202351065.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/wexosemu.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/44728957035.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210907/1043454432.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/pemafokuma.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/jefasududa.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/ralijigeb.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/36199932088.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/sotutumasobukuf.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nolap.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/35605047702.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/59591043868.pdfIn PDF document text
    • https://majubesar.com/contents/files/zowimafilagebopepaluzed.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/memunerikixu.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/zokemekesurudidiluvixapax.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rezibirerexosuvuw.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd9e2275d.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/37853036486.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/47699743338.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/sanemujozikufomaso.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/zogilenerabuwumozoturil.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/sasimaki.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/sixifotagex.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_off0000b862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB862 10792 bytes
SHA-256: 9f4ac2dcea1387c984a70b92183ab7946c5d38df7be80681756c70cbaaa82682
font_01_sfnt_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 15708 bytes
SHA-256: 7845fb2b9735530a0b0ea29538b14d96636646a825b87147fdc194546ceeee25

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