Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c094c37ce35f76…

MALICIOUS

PDF

83.5 KB Created: 2021-03-25 05:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e451de027900710c9634fb1755fe439a SHA-1: d0c34cd0e5ac6eb387f34a6e7e72823814eb2634 SHA-256: 75c094c37ce35f7685a03df951e9ddacb879a93982c1fb7590fc78126def92cb
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a significant portion pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URLs and the heuristic findings suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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://zajinet.ru/aws?utm_term=one+of+us+is+lying+character+analysis
    • https://cdn-cms.f-static.net/uploads/4496584/normal_6059dc956167a.pdf
    • https://cdn-cms.f-static.net/uploads/4501231/normal_604d19962264a.pdf
    • https://cdn-cms.f-static.net/uploads/4388819/normal_604a4810ba83f.pdf
    • https://static.s123-cdn-static.com/uploads/4369499/normal_5fc9a950ae6bf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_8994ada3f195455a83e292f7a51c78b3.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_52a9a503bf7a42958cbdca1a55150628.pdf?index=true
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_605958525bbe4fa78c13801e932cc25f.pdf?index=true
    • http://kizosit.rf.gd/88390169502.pdf
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_d4d873fe1e0543b0a669e1725228af19.pdf?index=true
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_419317634724421e9e6112231d1fc8b5.pdf?index=true
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_67bd755ff0e14061966942cc8656a8cd.pdf?index=true
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_dddd52fdd36e40ce86886a8f5daf0b1f.pdf?index=true
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_a1ba2becefa74224ac2cbb12c299fb92.pdf?index=true
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_315b8b364f174fd981dc1bd554f7f553.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_68ceee85fab141668887a774104f1a72.pdf?index=true
    • http://pavapivujuv.rf.gd/wumesukufelowewomabime.pdf
    • http://magivuxitafexox.rf.gd/zudifusanegilemejutixoj.pdf
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_d686aea985204c6c8739f6c6135aa536.pdf?index=true
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_4dc5b0fcd0b44e37815b664f813163f8.pdf?index=true
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_76ded6ea49de4673ab7b82b16b18aa3f.pdf?index=true
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_ba44b598368f41ef90b7cd90e2f48582.pdf?index=true
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_6d74f8ea142d4a3baee5309d21bc70a7.pdf?index=true
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_da056b2fddfa4feca2fb6e70dab7f26d.pdf?index=true
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_d60c458b36e94628b62d8fae7250a0b4.pdf?index=true
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_ab9c3cc3ca584927880cd4272211ec74.pdf?index=true
    • http://figobob.rf.gd/a_series_of_unfortunate_events_books_set.pdf
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_c83372503cc64fb8b7dafe1b3a6c0138.pdf?index=true
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_f8a833e8f4ce415fa21ba800b330882c.pdf?index=true
    • 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_off0001080b.bin
8f6129a6b05d9d350837d1c2cc1100b37aa80d891aaaecaa3e249558d446bdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 5272 bytes
font_01_sfnt_off00011a05.bin
844151db1214fa51d621da887623b2f35b8a381b25dce0c7ccf683adbdee6a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 11280 bytes

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