Malicious PDF — malware analysis report

Static analysis result for SHA-256 c998c9b6d0d2d100…

MALICIOUS

PDF

102.5 KB Created: 2021-05-03 11:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a65314229b4ec5fab820d6c7917a868 SHA-1: 61a8b19730bf3010837f39caf307fc67c3f94d44 SHA-256: c998c9b6d0d2d100ffc42e001763bc69e22461b570c3036461f9299618cd4b4b
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, including one that redirects through a link farm on disposable hosting, suggesting an attempt to obfuscate the final destination. The primary heuristic indicates external URI usage, pointing towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://botokaw.ru/strik?utm_term=sheridan+blue+streak+air+rifle+serial+number PDF link annotation
    • http://tigukifi.getenjoyment.net/42183469614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_6048a0110b104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5fdc6330a8bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450038/normal_6029b1b6d0119.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/deathwatch_codex_8th_vk.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/panchatantra_kathalu_in_english.pdfIn PDF document text
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/fiwowokope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_60123622034bc.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/physiotherapy_exercise_for_low_back_pain.pdfIn PDF document text
    • http://golixudib.mypressonline.com/caracteres_ascii.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/3683732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5fee09628490e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5feafde18967f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_5fd841f3cf4de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_6035805c5bd8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_60219b5443175.pdfIn PDF document text
    • https://fupebabo.weebly.com/uploads/1/3/4/6/134601971/puxovav-lusovored.pdfIn PDF document text
    • https://buwigare.weebly.com/uploads/1/3/5/3/135308802/5471596.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/3942065a3e65ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_24530177c6bf4c289e82d6fbe1b1baaf.pdf?index=trueIn PDF document text
    • http://jupegojut.atwebpages.com/34265603261.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_caec6f21c7b44a22a06a352e65b8e029.pdf?index=trueIn PDF document text
    • http://wizigipixe.atwebpages.com/sql_tutorial_2020.pdfIn PDF document text
    • http://totuxivez.onlinewebshop.net/does_roomba_960_have_smart_mapping.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 6416 bytes
SHA-256: 62deedb54aaef669db635f4ef87d4bda5d475a8bf20633d6b56d9e4ab12fd410
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_02_sfnt_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 5456 bytes
SHA-256: 1d14db8782eea396c8e54b454d5747890f33d88815b26dff9b30aced7377878b
font_03_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 9760 bytes
SHA-256: 25f744d8b9acb3029172aaf99601028861cb1b3b1208efbf5854d5c19753badc
font_04_sfnt_off00014558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14558 11192 bytes
SHA-256: 10a498885734090c21a5bb85bc5ad74a35cdc7893fcd54ddfb569281d8b38ff0
font_05_sfnt_off00016b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5F 16256 bytes
SHA-256: ade860a384e0436df56bb84eeed4a9486ec680d7c8981cdb0c3745c5e2239263
font_06_sfnt_off000180ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BA 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

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