Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a6d346865b3396…

MALICIOUS

PDF

93.4 KB Created: 2021-04-30 02:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9fd83700fe88748f6c02e8eaffddfe7 SHA-1: 600b3ca659dfa51edd00ea31152f90672e09a1b0 SHA-256: 81a6d346865b3396d3f5b5e60924b9311ab82adfe9265a5fb39526706688fe85
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=leaf+anatomy+coloring+worksheet+key
    • http://nozatisesufi.scienceontheweb.net/cambridge_pet_exam_examples.pdf
    • http://vuvabadiredowa.getenjoyment.net/kogofirokeluwixase.pdf
    • https://cdn.sqhk.co/jesovolavig/sCifjfB/mozesitigejuxixa.pdf
    • https://jateredadiwez.weebly.com/uploads/1/3/1/6/131606262/242468.pdf
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/666999ba9.pdf
    • https://cdn.sqhk.co/jigixomavola/h2hh3yp/pewdiepie_sub_count_before_t_series.pdf
    • https://radogatibemif.weebly.com/uploads/1/3/2/8/132815767/a51d0d6.pdf
    • http://nazorizuz.medianewsonline.com/3659056409.pdf
    • https://cdn.sqhk.co/dasekizob/jjgcege/berebuziwekojos.pdf
    • http://vipadobotisituz.mygamesonline.org/bosch_washing_machine_repairs_eastern_suburbs_melbourne.pdf
    • http://znohist.site/23159038778odrfk.pdf
    • https://cdn.sqhk.co/jolodovi/dcHgero/the_sims_4_zombie_apocalypse_mod_traducao.pdf
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/vagajaruvoba-repekedipekiku-fezebolid-tigit.pdf
    • http://studytogether.fun/kindle_fire_model_d01400_manualtnpvj.pdf
    • https://pepizowa.weebly.com/uploads/1/3/2/7/132711999/tifor.pdf
    • http://faponabon.mygamesonline.org/brief_publicitario.pdf
    • http://rat-red.space/sakabufabugog5s8lc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wenulusevikofa.myartsonline.com/botaxozijerina.pdf
    • http://lobopekogolo.onlinewebshop.net/classification_of_occupational_diseases.pdf
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_a4c36e078eaa468f8c49393aeee03756.pdf?index=true
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_fb13280b36434aa0a7ab39eb3dcf3d36.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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e9c.bin
bb4cde52be0fd431368c1a908e3e1e5853d098d3128f25e87b5f1dae8f8e8029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 5496 bytes
font_01_sfnt_off0001314b.bin
eb48dc338ae4c0b6d2c1cca5357dded462ca25595dc68aad408258c1f9b7288a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 11252 bytes
font_02_sfnt_off0001576a.bin
e6f5ba150f71d955d173293bbaad0c3de5ce2644afc0fec054f3062ff30d8061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1576A 6068 bytes

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