Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c3f372ede6cdae…

MALICIOUS

PDF

85.2 KB Created: 2021-02-27 12:10:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e1427e624ea096aef414f75fa4ba1ed SHA-1: ef7d25c64dde5e2733ddf1904795ac6cfaa8ddf5 SHA-256: b3c3f372ede6cdae27066bc35765028d48d53935ce4616f2a688488854de9406
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classification strongly supports maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/aws?utm_term=is+genie+intellicode+compatible+with+chamberlain
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/zolidame_lopomixofip.pdf
    • https://cdn.sqhk.co/sejujona/aROhglX/hymns_of_praise_and_thanksgiving_with_lyrics.pdf
    • https://cdn.sqhk.co/rosisole/Vghggrk/sizigu.pdf
    • https://pulakaxumif.weebly.com/uploads/1/3/0/7/130776647/pikelagaxilu.pdf
    • http://pazadixokumox.sportsontheweb.net/foxit_reader_print_multiples.pdf
    • https://cdn.sqhk.co/wozejodes/ficid2q/wumisi.pdf
    • https://cdn.sqhk.co/dosakupu/gdIhgQo/zipofibasur.pdf
    • https://cdn.sqhk.co/loxowopiv/icibgjy/xeguxiginenudisupiguzed.pdf
    • http://zeboxagekej.sportsontheweb.net/57685235720.pdf
    • http://wijetaz.mypressonline.com/dawegigunusewigo.pdf
    • http://kosamaritaj.getenjoyment.net/23447158864.pdf
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/6456873.pdf
    • https://cdn.sqhk.co/gunonutib/diggclV/tabexafarajag.pdf
    • https://cdn.sqhk.co/bawusipa/4gijihc/55673800921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jeborawaleko.atwebpages.com/the_heir_kiera_cass_wikipedia.pdf
    • https://s3.amazonaws.com/xamibudasagas/girovola.pdf
    • http://bifiwapaz.onlinewebshop.net/caracteristicas_de_los_personajes_del_libro_los_crimenes_de_la_calle_morgue.pdf
    • https://s3.amazonaws.com/sifawekujiki/ginipifemezob.pdf
    • http://vejegaba.atwebpages.com/xapavedawi.pdf
    • http://kivozusemu.atwebpages.com/jadezujejovugogarifutix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dc.bin
d45ee9b3087623ea7f6cbd2bf82ea57263786687ed0045ebca8aa46eb6bd6bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 5656 bytes
font_01_sfnt_off000107f9.bin
1ff0aaefd873ad35a032499aef7bf1cbadc634439274faf426cba9aeba77f24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 10836 bytes
font_02_sfnt_off00012d18.bin
02585c4f44654516ff63013864baa0c32923ef816ea2438fd88043366f1ed2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 16804 bytes

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