Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5c17d9e3f008cf…

MALICIOUS

PDF

87.7 KB Created: 2021-03-19 21:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a322747733bddb91f8c2bd9751f9459 SHA-1: 28eac7b156f30e0ca40cc8bc67e572ef6513b8ff SHA-256: ba5c17d9e3f008cfc5569d30aad05da26eb36b1697a7bcae0e5d4299650f9d5a
186 Risk Score

Malware Insights

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

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 0.9982

Heuristics 6

  • 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 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.
  • 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://nipisod.ru/strik?utm_term=what+are+some+good+family+feud+questions PDF link annotation
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/pemerusuliwa_vitetivakukakop.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/esieEuQ/firefox_60_esr_beta.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/5836554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_600d67c30c67d.pdfIn PDF document text
    • https://zadobezaja.weebly.com/uploads/1/3/0/7/130775221/3143564.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/eghibhf/96935267905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fda6a74b03de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_60494f71d46df.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/fanipojin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5fcef82d9b01d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_6009f91b0f3d2.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/boradejer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_60267800a8a26.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/jbeW4gc/one_earth_editorial_board.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/hgeihdI/nazamowetamunaxoveredif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_ccb534fa237341639524fa1edf649da8.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_1f5a6049abab4b9dba2cddc5ff936756.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_6a8014201bc34f04a483a927b12f040f.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_d156e249d1db4043a6eff479ef93e8a0.pdf?index=trueIn PDF document text
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_3190c20a8e9748a6a8debfe5f64cca87.pdf?index=trueIn PDF document text
    • https://e5aadbcf-511f-4ee2-989a-4410a22eeed0.filesusr.com/ugd/64930c_208cce15c1dd485facd097d2bc098519.pdf?index=trueIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_eb2892a644b44604a2144de79840af7f.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_02a5e03eac994b11b62314ed76df56e1.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 5560 bytes
SHA-256: beb1db413d930564b6d8a058e1b963ff1b710b8d22309befc63ac69d13583a06
font_01_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 2528 bytes
SHA-256: 161c3714e592dcce582c42e099e6b5ea66955031a2744d76d1c98d8655006e47
font_02_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 11056 bytes
SHA-256: 8c27e539027fed5aea44d6f377cc00a2e949b9a8b4ffa6059092cbb7214a1f51
font_03_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 17180 bytes
SHA-256: 5bc941a9f4dd6b9292530e8c09f372337f988e205df3ea1e73321c037aa41054