Malicious PDF — malware analysis report

Static analysis result for SHA-256 54be3340a3668892…

MALICIOUS

PDF

97.6 KB Created: 2021-02-27 06:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6507812e05dc30dd352407204d888f46 SHA-1: b5705257a813ed21b168a091c84c1ebc33929ea7 SHA-256: 54be3340a36688924be55d69df700486358b3cefef66d2d616a3598f363b5084
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=what+is+rehabilitation+services PDF link annotation
    • http://cashbackmoney.info/ffx_guide_celestial_weaponsmuoew.pdfIn PDF document text
    • http://ukranews.icu/matowujuvisejapuviwixpx5ya.pdfIn PDF document text
    • http://trendmobile.ru/gozexajosoxarekovesimahqjix.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/is_triton_neptunes_largest_moonba38t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_603230caac1a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_600635fe9a3d5.pdfIn PDF document text
    • http://vorecan.space/zutupileri6kq4u.pdfIn PDF document text
    • http://domastmsk.space/catia_v6_download_free_trial4u27b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451353/normal_5fe8936ad6cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_6028c7a0ce8a9.pdfIn PDF document text
    • http://rollernefrit.xyz/16314913684thokt.pdfIn PDF document text
    • https://petivevidimow.weebly.com/uploads/1/3/0/8/130813859/mizofevike.pdfIn PDF document text
    • http://save50.pro/accessing_the_dark_web_on_androidao2ip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libosokune/majotaxinajafiji.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/12397902159.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_off00014381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14381 5100 bytes
SHA-256: 9da13d065d0bd37f38fe207f2a5a985665c179e805d51520a8f20162544f8157
font_01_sfnt_off000154e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E4 10712 bytes
SHA-256: d885e66e4dd493c095fef82f368b1c5d26ff232b5798e69b956aa4268583d19c

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