Malicious PDF — malware analysis report

Static analysis result for SHA-256 9863b3cdc9fd16ca…

MALICIOUS

PDF

72.8 KB Created: 2021-01-26 10:03:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9023c0b765669442db2d3550e9884606 SHA-1: d6d2436a9938b27db157d5f6f48a409aa323e27c SHA-256: 9863b3cdc9fd16cae9dcb0a877a94eff2ec5905540b8a5cff6b336688703920f
104 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 other PDFs, which is indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to malicious content or facilitate further downloads, potentially related to malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/123?utm_term=insta+auto+followers+apk+download PDF link annotation
    • https://munelexogetajax.weebly.com/uploads/1/3/1/4/131437313/ba603c1fda54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479240/normal_5ff4eb9b78caf.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/rafub.pdfIn PDF document text
    • http://faketikus.22web.org/graphic_design_photo.pdfIn PDF document text
    • http://prodive.su/nojetolipituba3tfu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503692/normal_5fde19ac9c3b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451753/normal_5fce2f54d04ae.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/djewic4/chat_americanas_sac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5fe83b2d65136.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/wefetup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461234/normal_600a8e0d34f7a.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/rgcjgpY/16327769467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374686/normal_600caa8bec994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc81908e2a34.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/3vicd3V/smart_card_reader.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470222/normal_5fe1c4ea2235c.pdfIn PDF document text
    • https://cdn.sqhk.co/rimiwetatu/5K07hV1/pickme_driver_apk_new_version.pdfIn PDF document text
    • http://foodguideblog.com/cross_stitch_letters_on_crochet6u8hk.pdfIn PDF document text
    • https://wodumipanopova.weebly.com/uploads/1/3/4/7/134731655/927e94fde5b3034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jugikan.epizy.com/carvedilol_fa_davis.pdfIn PDF document text
    • http://jilovin.epizy.com/dojigitu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF69 5128 bytes
SHA-256: 5ac527e705ba9c09e5d80085399c4454fd9f57d9d6a73cf59c867691658f8e7e
font_01_sfnt_off0000f0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FF 10620 bytes
SHA-256: e2d1f544ad48ca0ee4ebc09815cbb129d61ff5f61a3fc9d0e6aaf0668f06a626

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