Malicious PDF — malware analysis report

Static analysis result for SHA-256 420884557b6bf35d…

MALICIOUS

PDF

93.1 KB Created: 2021-10-08 04:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fde1a86b4f82cb630ada116e9987a3a2 SHA-1: 9552977a11deaa447d03d5b3aed05c273510c776 SHA-256: 420884557b6bf35d65298d36be1f66874bdcecf2920b7623185f49bd45c87ca2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a high-confidence ML classifier flagging it as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links pointing to potentially malicious content. The presence of external URIs and the overall structure suggest this document is designed to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=chicago+method+of+referencing PDF link annotation
    • http://letresorellebio.it/userfiles/files/62347873929.pdfIn PDF document text
    • http://pasted-radio.de/web/files/nunebinokakenuj.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/70054938128.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/kalavedonaxis.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/jifizapabon.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/femagodawusevi.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/22910505877.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6535e42d---20335420593.pdfIn PDF document text
    • http://imbirimbir.ru/files/83944099287.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jeresowivodin.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kigevufaxe.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202110061751274902.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/bofurasow.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/vurabaterekejolawo.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/texarobulamomikoduke.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6991df4---71097147754.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/logek.pdfIn PDF document text
    • http://methese.com/upload/files/boxekelum.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/485909893.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/biruzim.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/74347891514.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/mefona.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/mapesugepodizewogax.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_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 20584 bytes
SHA-256: a455358f418d5d1a70acc7cc106a88b2d32768a17389da9edfdbfe09b81ce4d0
font_01_sfnt_off000136d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 10740 bytes
SHA-256: e2f5f501eef0526c2f8c8a68017afb70ac1464cfd162eaacf3946c40968f3896

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