Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11cc9c4257d9117…

MALICIOUS

PDF

97.3 KB Created: 2021-03-21 12:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 69d7048b80c4a5838e71fc34cdae97a9 SHA-1: c1ea1fc98a0492765a8269025e11dfa47d9f5885 SHA-256: c11cc9c4257d911778cb6be36f375a3e8b78e57bd42cb7e7531e704a3a2163eb
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector link, specifically designed for phishing disguised as a free download. The embedded URL points to a suspicious domain, and the ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL suggest it's intended to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=booklet+maker+from+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484609/normal_5fd1315c13f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd2a14948ce0.pdfIn PDF document text
    • http://natiwuzoxosob.22web.org/karan_benipal_video_song.pdfIn PDF document text
    • http://wotukujis.sportsontheweb.net/xusuwanerawupuriletadul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_60132a04d39e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_c8bcffc2d8f74c2fa6a1acdb151c169f.pdf?index=trueIn PDF document text
    • http://xetubuvij.rf.gd/avalon_newport_pellet_stove_manual.pdfIn PDF document text
    • http://dojafeduzig.myartsonline.com/sojapadekinup.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/yevgeny_zamyatin_we_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/no_broker_app_apk.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_d5ce296c5da74e63b526c495e0bc2a31.pdf?index=trueIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_d9984572da1b4be8b6d36bfc074a0698.pdf?index=trueIn PDF document text
    • http://dokelegusipodi.epizy.com/98044858361.pdfIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_805711d3eee6417a9e4df6fef252b366.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_40bdc790e77d46dda5d505f82797c7d5.pdf?index=trueIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_70186f13e8fa4015b5af056c73e43ce6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/velekiloxitudojugetelitot.pdfIn PDF document text
    • http://gigezevozaf.epizy.com/15094456521.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/husqvarna_yth22v42_manual.pdfIn PDF document text
    • http://gizivafufet.rf.gd/92704765528.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_2ded4935cd174dd78bd8895983b43ac5.pdf?index=trueIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_ca5fc6e77cf248969feaf081854e33a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisazabe/community_acquired_pneumonia_idsa_guidelines_2019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 4756 bytes
SHA-256: 0ae497e4ae73440628eb7d34109112d52e0668873ba38764b40ea4837f4aa8d1
font_01_sfnt_off000141e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E7 11776 bytes
SHA-256: 9ab20f39222d6c3f153abb27d03a6b82ac85e531a715471e4e76f8295bbb936f
font_02_sfnt_off000169cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2