Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8239048a9532d1b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-03 21:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b309fc73dc452fc669fe6f7d3d1cea05 SHA-1: 25fcefd9aa792e31c1036dfedbdbf87efcd2c353 SHA-256: b8239048a9532d1b0e4802c06d2d32ea49dfd6bd67b5e6af8d0740b1d63693f3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly random PDF files, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it is designed to redirect users to potentially malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://resalured.ru/123?utm_term=harry+potter+characters+read+the+goblet+of+fire+fanfiction
    • https://cdn.sqhk.co/guwuweri/ejim9hj/xizixezopovolipobo.pdf
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5feb25efd54ec.pdf
    • https://cdn-cms.f-static.net/uploads/4408996/normal_60298cb273817.pdf
    • https://cdn.sqhk.co/vuwipabobatu/9dVYhfO/fivise.pdf
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/niwere-xolameletuz-fuluwufigika.pdf
    • https://nepigisebax.weebly.com/uploads/1/3/4/4/134477897/lujededivudis-jirod-vawevagugumuf-xigavapa.pdf
    • https://cdn-cms.f-static.net/uploads/4481162/normal_60244afc5c518.pdf
    • https://gusoretudofuriv.weebly.com/uploads/1/3/4/8/134885571/c8c60.pdf
    • https://cdn.sqhk.co/kitaparek/jfg90jc/85767157443.pdf
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/fomixig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vavapekadoliti/butyl_chloroformate_msds.pdf
    • https://s3.amazonaws.com/rogugagatuf/bticino_manuale_cronotermostato.pdf
    • https://s3.amazonaws.com/mosezavor/54970282591.pdf
    • https://s3.amazonaws.com/jofunozuzof/bovovum.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/alexandre_o_grande_filme.pdf
    • https://s3.amazonaws.com/wanasuvedigo/bal_hanuman_full_hd_movie.pdf
    • https://s3.amazonaws.com/xupizewuxere/george_foreman_grill_guidelines.pdf
    • https://s3.amazonaws.com/pojikovewijeja/29599434164.pdf
    • https://s3.amazonaws.com/sinamozagemoger/85246068894.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/jovamuledukakilunanaxad.pdf
    • https://s3.amazonaws.com/xonobijikivo/68769999762.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin
e5f9b14dd25ec1c3b2fc51e118387f762fccfa4d18f2935d059e9dd1722001eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5620 bytes
font_01_sfnt_off000103ac.bin
72a99f3fd360b37c421a7f9a36b48e69fce23df111c5a19f9139c3475cd59fac
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 10464 bytes